Medical Students' Disease

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.

Baars (2001) writes that medical students who study "frightening diseases" for the first time routinely experience vivid delusions of having contracted such diseases, and describes it as a "temporary kind of hypochondria". Baars says that the experience is so common that it has become known as "medical student syndrome".

Hodges (2004), reviewing the literature, said that "the first descriptions of medical students' disease appeared in the 1960s." He may have been referring to the phrase, for the phenomenon itself was noted much earlier. George Lincoln Walton (1908) reported that

Medical instructors are continually consulted by students who fear that they have the diseases they are studying. The knowledge that pneumonia produces pain in a certain spot leads to a concentration of attention upon that region which causes any sensation there to give alarm. The mere knowledge of the location of the appendix transforms the most harmless sensations in that region into symptoms of serious menace.
Hodges also said that it was suggested in the 1960s that:

this phenomenon caused a significant amount of stress for students and was present in approximately 70 to 80 percent of students... papers written in the 1980s and 1990s conceptualized the condition as an illness in the psychiatric spectrum of hypochondriasis.... Marcus found that the dream content of year two medical students frequently involved a preoccupation with personal illness. Marcus's subjects reported many dreams in which they suffered illnesses of the heart, the eyes and the bowels, among others.
Hodges went on to describe work by Moss-Morris and Pétrie who saw medical students' disease as "a normal perceptual process, rather than a form of hypochondriasis." Learning about a disease "creates a mental schema or representation of the illness which includes the label of the illness and the symptoms associated with the condition. Once this representation is formed, symptoms or bodily sensations that the individual is currently experiencing which are consistent with the schema may be noticed, while inconsistent symptoms are ignored."

Howes and Salkovskis (1998) noted that "medical students frequently develop fears and symptoms of illness. This has been termed medical student's disease, nosophobia, hypochondriasis of medical students, and medicalstudentitis." They mentioned two studies, one concluding that about 70% of medical students have groundless medical fears during their studies, and one which found that 78.8% of a randomly chosen sample of medical students showed a history of "medical student disease." However, they cite a  of studies showing a similar incidence of hypochondria in law students and other non-medical students, which they said call into question "the widely held view that medical students are more likely than others to have excessive anxiety about their health."

Adapted from wiki