Somatoform disorder is defined according to (DSM-IV-TR) criteria. Disorders in this category include those where the symptoms suggest a medical condition but where no medical condition can be found by a physician. Patients with a somatoform disorder might experience significant pain without a medical or biological cause. Pain disorder is one of the five somatoform disorders and is considered to have a poor prognosis. It often involves other symptoms such as depression, anxiety and drug abuse. What is somatoform: When physical symptoms are caused by mental or emotional factors it is called somatisation. For example, many people have occasional headaches caused by mental stress. But, stress and other mental health problems can cause many other physical symptoms. For example: chest pains, tiredness, dizziness, back pain, feeling sick, etc.