These are the disorders that cause mental suffering to a patient making them unable to perform normal everyday functions.
Mental disorders may involve changes in a person's behavior, feelings, an unexplainable outlook toward people and situations, an inability to take social decisions, and altered social interactions.
There are several factors that contribute to a mental disorder however no specific one is validated as the sole reason.
The environment in which a person spent their formative years, genetic history of depression or anxiety, and lack of support or peer group are often the major reasons that have led people into becoming patients with mental disorders.