Sonya has been ill for the past year. She has been to different medical doctors who cannot find a reason for her illness. At first, her ankles would swell, and she would get pain in her calves. She later started developing headaches on a regular basis. She then experienced pain generating from her thumb to her wrist. Sonya has had blood tests, MRIs, and CAT scans that all turn out negative. She is anxious that no one can determine what is wrong with her, especially since she spends a lot of time trying to figure out her illness. Sonya would be diagnosed with which of the following?
a. Illness anxiety disorder
b. Somatic symptom disorder
c. Factitious disorder
d. Conversion disorder