Somatic symptom and related disorder which is matched somatoform disorder in DSM-IV, is defined as a group of diseases that shows somatic symptoms with significant distress and impairment according to DSM-V. This is a very common disease in primary care, however, tends to be underdiagnosed or misdiagnosed because of its polymorphic symptomatic expressions. This review tried to help understanding somatic symptom and related disorder and its subcategorized diseases-somatic symptom disorder, illness anxiety disorder, factitious disorder and other specified and unspecified somatic symptom and related disorder.