Identify illness anxiety disorder only after a proportionate medical assessment, then replace repeated reassurance and fragmented testing with one coordinating clinician, structured cognitive-behavioral therapy, and treatment of comorbid psychiatric illness.

Diagnosis

Recognize the illness-anxiety pattern after proportionate medical assessment

Make the diagnosis from the longitudinal pattern, not from a negative test alone.

Illness anxiety disorder is characterized by excessive worry about having or developing a serious undiagnosed condition, with persistent fear despite normal physical examination and laboratory findings. The diagnostic pivot is disproportionate health preoccupation, anxiety, and functional interference rather than absence of all bodily symptoms. PubMedPubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf

Elicit the behavioral phenotype at each visit: repeated requests for testing or reassurance, frequent clinician changes, disease-focused online research, avoidance of appointments, and avoidance of treatments because disease or adverse effects are feared. Care-seeking and care-avoidant forms are both described; either pattern supports a focused plan rather than reflexive escalation of testing. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Document functional consequences that establish clinical urgency: occupational absence, financial burden from repeated medical visits, and impaired relationships. Screen for major depressive disorder, other anxiety disorders, and personality pathology because these comorbid psychiatric conditions occur at increased frequency and may require parallel treatment. PubMedPubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf

Use the term illness anxiety disorder when illness preoccupation is the dominant syndrome; DSM-5 replaced hypochondriasis with illness anxiety disorder and somatic symptom disorder. Wiley+2WileyAnnual Research Review: Health anxiety in children and ...ScienceDirectThe moderating effect of age among patients in primary care PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf
Consider somatic symptom disorder when distress and maladaptive thoughts or behaviors are organized around prominent somatic symptoms rather than primarily around fear of an occult illness. Wiley+2WileyAnnual Research Review: Health anxiety in children and ...ScienceDirectThe moderating effect of age among patients in primary care PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Clinical patterns that direct the next evaluation and management step. PubMed+1PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Pattern	Discriminator	Next action
Illness anxiety disorder	Persistent fear of serious disease despite appropriate normal examination and laboratory findings; preoccupation dominates. PubMedPubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf	Establish one coordinated care plan and offer CBT; assess psychiatric comorbidity. PubMed+1PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Somatic symptom disorder	The former hypochondriasis construct was divided into somatic symptom disorder and illness anxiety disorder; distinguish whether prominent somatic symptoms organize the presentation. Wiley+1WileyAnnual Research Review: Health anxiety in children and ...ScienceDirectThe moderating effect of age among patients in primary care	Address symptom burden and maladaptive illness-related thoughts and behaviors rather than applying the illness-anxiety label solely because tests are unrevealing. Wiley+1WileyAnnual Research Review: Health anxiety in children and ...ScienceDirectThe moderating effect of age among patients in primary care
Care-seeking phenotype	Frequent medical utilization, reassurance requests, or changes in medical care. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC	Coordinate care to limit fragmented reassurance and unnecessary procedures. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Care-avoidant phenotype	Avoids medical care because confirmation of illness or treatment adverse effects are feared. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC	Clarify what evaluation is medically indicated, address avoidance directly in psychotherapy, and avoid equating avoidance with absence of risk. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Medical Safety

Exclude active disease without converting evaluation into reassurance therapy

Use symptom-driven assessment and reassess when the clinical presentation changes.

Do not attribute a potentially acute presentation to anxiety before evaluating time-sensitive disease. For chest pain, the differential includes acute cardiopulmonary, gastrointestinal, chest-wall, toxicologic, and psychological causes, including panic disorder and anxiety; follow a chest-pain evaluation pathway rather than using a psychiatric history to truncate assessment. AHA JournalsAHA Journals2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR ...

After history, examination, and targeted testing support no active medical explanation for the current concern, communicate the positive formulation: the symptoms and fear are real, the immediate dangerous condition has been assessed, and the next intervention targets the illness-preoccupation cycle. Repeated normal results may not reduce anxiety and can instead become another reassurance-seeking behavior. PubMed+1PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Avoid the opposite error: a diagnosis of illness anxiety disorder does not immunize a patient from new disease. Reopen the medical differential when there is a new objective examination finding, a changed symptom pattern, a new exposure or medication risk, or a syndrome-specific indication for testing; otherwise, preserve continuity with the established clinician and plan. AHA Journals+2AHA Journals2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR ...PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

For acute chest pain, retain pulmonary embolism, pneumothorax, pneumonia, acute gastrointestinal disorders, chest-wall disorders, and psychological causes in the differential; anxiety is one listed cause, not a rule-out diagnosis. AHA JournalsAHA Journals2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR ...
Explain in advance which symptoms or objective changes will trigger reassessment; this sets a safety net without promising open-ended serial testing. PubMed+1PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Testing strategy for medical concerns in a patient with suspected illness anxiety disorder. AHA Journals+2AHA Journals2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR ...PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Clinical situation	Interpretation	Action
New potentially acute symptom syndrome	Psychological causes coexist in the differential with cardiopulmonary, gastrointestinal, chest-wall, and toxicologic disease. AHA JournalsAHA Journals2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR ...	Perform condition-appropriate acute evaluation before attributing symptoms to anxiety. AHA JournalsAHA Journals2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR ...
Persistent illness fear after normal targeted assessment	Persistent fear despite normal examination and laboratory testing is characteristic of illness anxiety disorder. PubMedPubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf	Name the diagnosis, shift to a behavioral treatment plan, and avoid repeating tests solely to reduce anxiety. PubMed+1PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
New objective or syndromically changed presentation	Illness anxiety disorder may coexist with medical disease. PubMedPubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC	Reassess the medical differential and select testing based on the new clinical finding rather than the prior psychiatric diagnosis. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Management

Use a coordinated care structure to reduce reinforcement of health anxiety

The care relationship is part of the intervention.

Assign a single clinician or tightly coordinated team to integrate new symptoms, prior testing, and follow-up. This is particularly important for care-seeking patients, who may undergo extensive medical care, invasive diagnostics, and even unnecessary elective surgery when anxiety-driven utilization is not contained. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Replace ad hoc reassurance visits with planned follow-up focused on function, avoidance, reassurance-seeking, and engagement in treatment. During each encounter, validate distress while avoiding prolonged disease-by-disease debate; excessive reassurance and excessive focus on medication can worsen anxiety in some patients. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

For care-avoidant patients, identify the specific feared consequence of evaluation—diagnostic confirmation, a procedure, or treatment effects—and make a limited, explicit plan for medically indicated assessment. The objective is neither forced reassurance nor indefinite deferral, but completion of needed care while treating avoidance. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Coordinate psychiatric and medical care when symptom-related utilization is high or when a real chronic medical disorder coexists with health anxiety. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Track functional targets, such as work attendance, appointment avoidance, clinician switching, and time spent researching illness, rather than using test completion as the principal outcome. PubMed+2PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Behavioral patterns and clinician responses that avoid reinforcing the illness-anxiety cycle. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Observed behavior	Clinical risk	Response
Repeated reassurance requests	Short-lived reassurance can perpetuate health-focused monitoring and repeated utilization. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC	Use a consistent formulation, planned follow-up, and CBT referral rather than serial reassurance testing. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Frequent clinician changes	Fragmented assessment increases the risk of duplicative medical care. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC	Consolidate records and designate a coordinating clinician. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Extensive online disease research	Obsessive health research is described in illness anxiety disorder and can amplify preoccupation. PubMedPubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC	Include research and checking behaviors as treatment targets in CBT. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Avoidance of visits or treatment	Avoidance may delay needed assessment or treatment. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC	Specify the minimum medically indicated evaluation and treat avoidance as a behavioral target. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Definitive Treatment

Prioritize CBT and use medication as an adjunct when indicated

Target catastrophic interpretation, checking, reassurance seeking, and avoidance.

Refer for structured cognitive-behavioral therapy directed at health anxiety. CBT has established efficacy across anxiety disorders, and treatment approaches for anxiety disorders have improved prognosis in illness anxiety disorder. Nature+2NatureAnxiety disorders | Nature Reviews Disease Primers Oxford Academic12 Research Agenda for Anxiety Disorders - Oxford Academic PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC

Offer remote CBT when access or attendance barriers prevent in-person therapy. In a primary-care noninferiority study of untreated hypochondriasis, 12 weekly internet-CBT modules with automated therapy, therapist messaging, and outreach for incomplete modules were compared with 12 weekly face-to-face CBT sessions; both interventions reduced illness-related preoccupation and anxiety. NEJMNEJMInternet CBT for Hypochondriasis | NEJM Clinician

Use an SSRI as an adjunct when psychotherapy is unavailable, insufficient, or when comorbid anxiety or depression warrants pharmacotherapy, with medication selection and dosing guided by the treated comorbidity and current prescribing guidance. Randomized trials support SSRI efficacy in illness anxiety disorder, although psychotherapy may be more effective and is often better accepted by patients. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Do not let pharmacotherapy become a new reassurance ritual. Discuss expected benefits, adverse effects, and adherence briefly and consistently, then return attention to behavioral treatment goals; excessive medication focus may worsen health anxiety. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Choose a CBT program that explicitly addresses illness beliefs, body monitoring, online research, reassurance seeking, and avoidance; generic supportive contact alone may leave the maintaining behaviors unchanged. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Consider internet-delivered CBT for patients who cannot attend in person, but assess completion because the studied program included therapist outreach when modules were not completed. NEJMNEJMInternet CBT for Hypochondriasis | NEJM Clinician
Address comorbid major depression, other anxiety disorders, and personality pathology alongside illness anxiety disorder rather than assuming health anxiety is the sole driver of impairment. PubMedPubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf

Treatment selection for illness anxiety disorder. NEJM+2NEJMInternet CBT for Hypochondriasis | NEJM Clinician PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Intervention	Best use	Key tradeoff
Structured CBT	First-line psychological intervention for illness preoccupation, checking, reassurance seeking, and avoidance. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC	Requires engagement with feared sensations, uncertainty, and behavior change rather than repeated diagnostic certainty. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Internet-delivered CBT	Access barrier to face-to-face therapy; studied as 12 weekly modules with therapist messaging and follow-up for noncompletion. NEJMNEJMInternet CBT for Hypochondriasis \| NEJM Clinician	Completion and therapeutic support should be monitored. NEJMNEJMInternet CBT for Hypochondriasis \| NEJM Clinician
SSRI	Adjunct when psychotherapy is unavailable or insufficient, or when comorbid anxiety or depression also requires pharmacotherapy. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC	May be less effective than psychotherapy for illness anxiety disorder and can become a focus of health-related worry. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Integrated medical-psychiatric care	High utilization, clinician switching, care avoidance, or coexisting medical disease. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC	Requires communication that preserves medical safety while limiting repetitive reassurance. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Follow-up

Monitor function, healthcare utilization, and comorbidity rather than reassurance alone

A normal test result is not the primary treatment outcome.

At planned follow-up, assess change in illness preoccupation, checking and research behaviors, care avoidance, unscheduled contacts, clinician switching, and occupational or relationship function. Illness anxiety disorder can cause disability, work absence, financial distress, and relationship impairment; improvement in these domains is more clinically meaningful than transient relief after reassurance. PubMedPubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf

Escalate psychiatric treatment when health anxiety remains functionally disabling despite a coordinated medical plan and engagement attempts, when comorbid major depression or other anxiety disorder is prominent, or when repeated utilization exposes the patient to invasive or unnecessary procedures. PubMed+2PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Maintain a dual-track plan: preserve a defined route for reassessing new medically meaningful symptoms while continuing CBT and coordinated care for established health anxiety. This approach avoids both diagnostic overshadowing and reinforcement of recurrent reassurance seeking. AHA Journals+2AHA Journals2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR ...PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Review all prior evaluations before ordering repeat testing to identify duplication and to clarify what would constitute a clinically meaningful change. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
When the patient has a medical condition, treat the medical disorder according to its own indications while separately addressing the disproportionate illness fear and health behaviors. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC

Follow-up domains that indicate whether management is working. PubMed+2PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Domain	Improvement signal	Escalation signal
Function	Less work absence, financial burden, and relationship disruption. PubMedPubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf	Persistent disability despite coordinated care and treatment engagement. PubMed+1PubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Healthcare use	Fewer unplanned reassurance contacts, clinician changes, and duplicative procedures. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC	Ongoing extensive care use or pursuit of invasive and unnecessary interventions. PubMed+1PubMedToward a Lifestyle Medicine Approach to Illness Anxiety Disorder (Formerly Hypochondriasis) - PMC PubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Avoidance	Completion of medically indicated visits or treatments despite fear. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC	Continued avoidance of needed assessment or treatment. PubMedPubMedSevere Illness Anxiety Treated by Integrating Inpatient Psychotherapy With Medical Care and Minimizing Reassurance - PMC
Psychiatric comorbidity	Improvement in coexisting depression or anxiety symptoms. PubMedPubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf	Emergent or persistent major depression, other anxiety disorders, or personality pathology affecting care. PubMedPubMedIllness Anxiety Disorder - StatPearls - NCBI Bookshelf

Recognize the illness-anxiety pattern after proportionate medical assessment

Exclude active disease without converting evaluation into reassurance therapy

Use a coordinated care structure to reduce reinforcement of health anxiety

Prioritize CBT and use medication as an adjunct when indicated

Monitor function, healthcare utilization, and comorbidity rather than reassurance alone

References