The Development of Illness Anxiety Disorder in a Patient After Partial Thyroidectomy

The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), characterises illness anxiety disorder (IAD) as the preoccupation with having or acquiring a serious illness in the absence of somatic symptoms (or, if present, symptoms that are only mild in severity). DSM-5 includes illness anxiety disorder in the category called somatic symptom and related disorders, characterised by prominent somatic concerns, distress, and impaired functioning. More often than in psychiatric settings, individuals with illness anxiety disorder are encountered in primary care and specialist medical settings. Despite negative laboratory results, the benign course of the alleged disease over time, and adequate reassurances from specialists, their conviction of being ill persists. Illness anxiety preoccupations are heterogeneous, and the degree of insight is variable. Their illness-related preoccupation interferes with their relationships with family, friends, and coworkers. They are frequently addicted to internet searches about their feared illness, inferring the worst from the information (or false information) they uncover. Patients with illness anxiety disorder often have comorbid psychopathology, especially anxiety and depressive disorders. Typically, illness anxiety disorder is chronic. Physical symptoms are absent or mild and frequently represent a misinterpretation of normal bodily sensations. This case report presents the case of a patient diagnosed with IAD by a psychiatrist. The patient had been seen by his primary care physician and therapist for three years without any improvement in his symptoms before he was referred to a psychiatrist. After undergoing a partial thyroidectomy in 2018, this patient has been experiencing increasing symptoms of recurrent anxiety/fear consistent with IAD, despite extensive medical examinations that have consistently revealed normal results.