Somesh is overly occupied with the thought that he is getting symptoms of cancer. He had visited doctors many times and no such disease was diagnosed. He might be suffering from:-

Illness anxiety disorder

Somesh, who is overly occupied with the thought that he is getting symptoms of cancer despite medical reassurance, might be suffering from "Illness Anxiety Disorder." Illness Anxiety Disorder involves excessive worry about having a serious medical condition despite little or no medical evidence to support the belief.

The other options listed, somatic symptom disorder, obsessive-compulsive disorder, and conversion disorder, are not as likely in this case.

• Somatic symptom disorder is a condition characterized by physical symptoms that are not caused by a medical condition. Somesh does not appear to be experiencing any physical symptoms, so this disorder is unlikely.

• Obsessive-compulsive disorder is a condition characterized by intrusive thoughts (obsessions) and repetitive behaviors (compulsions). Somesh's preoccupation with the thought of cancer is not a classic obsession, and he does not appear to be engaging in any compulsive behaviors, so this disorder is also unlikely.

• Conversion disorder is a condition characterized by physical symptoms that are caused by psychological stress or trauma. Somesh's preoccupation with the thought of cancer is not a psychological stressor or trauma, so this disorder is also unlikely.