Psychology has close relationship with medical science. Knowledge of psychology helps the physicians in the treatment of certain diseases like peptic ulcer, asthma, migraine headache etc., which are called psycho-physiological disorders.
In this modern age, physicians admit that most physical diseases emanate from psychological disturbances, and are therefore, psychophysiological in nature.
We cannot understand and treat a disease without recognizing the emotional conflicts that patients go through. Certain degree of psychological help and counseling are necessary for helping patients face their physical problems and recover from their illness. Similarly the knowledge of certain physical diseases and the functioning of bodily organs help the psychologists to understand human behaviors.
A psychiatrist, who treats the psychological diseases, examines the physical health conditions of the patients. So psychology and medical science are closely related.