The distinction between psychiatry and psychology is often not obvious, as the difference between psychiatric and psychological problems is, at times, not obvious. Psychiatry generally uses medication primarily to treat more serious mental illnesses, such as schizophrenia, bipolar disorder, and paranoid psychosis. Psychiatry mainly uses psychological counseling or psychotherapy for milder mental problems, psychological problems, or severe mental disorders in the consolidation and maintenance phases. However, the psychology department sometimes uses some anti-anxiety drugs, antidepressants, and even antipsychotic drugs to treat patients with significant anxiety and depression. If the patient’s anxiety or depression is particularly pronounced, or even reaches a psychotic state, such as hallucinations, delusions, excitement, agitation, or even aggressive behavior, he or she needs to be treated in psychiatry.