Mental disorder also called a psychiatric disorder or mental illness. Mental health problems might be related to extreme stress due to a particular situation or arrangement of occasions. Mental disorders are often physical as well as emotional and psychological; mental illnesses may be caused by a reaction to environmental stresses. There are more than 200 classified forms of mental disorders include depression, schizophrenia, bipolar affective disorder, and other psychoses, dementia, intellectual disabilities and developmental disorders including autism. Symptoms like change in personality, mood, personal and/or social withdrawal.