A Psych Ward is usually a sub-unit of a regular hospital specializing in treating severe mental disorders, such as depression, schizophrenia, bipolar disorder, and major depressive disorder. Although psych wards treat mental illnesses exclusively, physicians and allied health professionals are available to address other medical conditions. Psych wards vary widely in their size and grading. Some hospitals may specialize in the temporary or permanent containment of patients who need routine assistance, treatment, or a specialized and controlled environment due to a psychiatric disorder.