pertaining to a physical disorder that is caused by or notably influenced by emotional factors.Some physical diseases are believed to have a mental component derived from the stresses and strains of everyday living.It is still difficult to classify some disorders as purely physical, mixed psychosomatic, or purely somatoform. One example is Irritable Bowel Syndrome (IBS) that was considered formerly as having purely mental causes, while subsequent research showed significant differences in the behaviour of the gut in IBS patients. On the other hand, there are no actual structural changes in IBS patients and research shows that stress and emotions are still significant factors in causing IBS.Psychosomatic medicine is considered a subspecialty of the fields of psychiatry and neurology. Medical treatments and psychotherapy are used to treat psychosomatic disorders.