Answer:
A mental disorder is characterized by disruption in normal reasoning, feeling, temper, behavior, or interpersonal interactions.
Most mental disorders are not caused by a single factor but by a combination of several factors.
The major factors that contribute to the development of mental disorders are not well understood but could be biological, psychological, and environmental factors.
Mental disorders include: depression, bipolar disorder, schizophrenia and other psychoses, dementia, and developmental disorders.