General psychiatry serves to diagnose, treat, and prevent mental, behavioral, and emotional disorders. A psychiatrist specializes in mental health disorders in addition to substance use disorders. When assessing psychological problems, psychiatrists examine both the mental and physical components and symptoms. Psychiatrists are also qualified physicians capable of performing or ordering psychological and laboratory tests. General psychiatry uses these tests, when necessary, harmoniously with discussions with the patient gleaned through psychotherapy to collect a full understanding of the patient’s mental and physical state. Psychiatrists' clinical training and education prepare and enable them to understand the patient’s psychological and emotional state in a greater context when necessary. Psychiatrists make a diagnosis and work with patients to establish a treatment plan that works best for them, taking into account the mental and emotional state of the patient and any influencing factors such as genetics and other medical illnesses. There are many mental health conditions, and they are varied in cause and appropriate treatment. Generally speaking, however, the most common treatment is a combination of therapy and medication.