What is the psychological term for the feeling of being unwell without any physical cause?

The psychological term for the feeling of being unwell without any physical cause is hypochondriasis. This condition, now more commonly referred to as illness anxiety disorder, involves a person being preoccupied with having or acquiring a serious illness, often interpreting normal bodily functions or minor symptoms as signs of a severe medical condition. This preoccupation persists despite medical evaluations and reassurances that no serious health issues are present.

In contrast, somatization involves physical symptoms that are not explained by medical conditions but are not purely focused on illness anxiety. Malingering refers to the intentional production or feigning of symptoms for some external incentive, such as avoiding work. Delusions are firmly held false beliefs that are not subject to reason or contradictory evidence, often related to mental illnesses rather than a focus on physical well-being. Understanding the distinction among these terms helps clarify the specific nature of hypochondriasis as it relates to anxiety about health without identifiable physical causes.