Wiktionary
n. A form of hypochondriasis in which medical students perceive themselves or others to be experiencing the symptoms of a disease they are studying.
Wikipedia
Medical students' disease (also known as second year syndrome or intern's syndrome) is a condition frequently reported in medical students, who perceive themselves to be experiencing the symptoms of a disease that they are studying.
The condition is associated with the fear of contracting the disease in question. Some authors suggested that the condition must be referred to as nosophobia rather than "hypochondriasis", because the quoted studies show a very low percentage of hypochondriacal character of the condition, and hence the term "hypochondriasis" would have ominous therapeutic and prognostic indications. The reference suggests that the condition is associated with immediate preoccupation with the symptoms in question, leading the student to become unduly aware of various casual psychological and physiological dysfunctions; cases show little correlation with the severity of psychopathology, but rather with accidental factors related to learning and experience.