A nurse is caring for a client who describes extreme fear of having or acquiring a disease. The client is also exhibiting behaviors like repeated body checking. The nurse should identify that the client is exhibiting manifestations of which of the following disorders?

A. Functional neurological symptom disorder. This condition involves neurological symptoms, such as paralysis or seizures, that cannot be explained by medical findings. The symptoms are not related to fear of disease or body checking, making this option irrelevant in this scenario. B. Illness anxiety disorder. This disorder is characterized by excessive worry about having or acquiring a serious illness, often accompanied by behaviors like repeated body checking. Clients misinterpret normal bodily sensations as signs of severe disease, which aligns with the client's described symptoms. C. Somatic symptom disorder. This disorder involves experiencing physical symptoms that cause significant distress or impairment, but the focus is on the symptoms themselves rather than an excessive fear of disease. The behaviors described in the question are more indicative of illness anxiety disorder. D. Factitious disorder. This involves intentionally producing or feigning symptoms for the purpose of assuming the sick role, rather than from a fear of disease. The client’s fear and checking behaviors do not fit this disorder's criteria.