A psychiatrist is a medical doctor who specializes in diagnosing, treating, and preventing mental health disorders. Unlike other mental health professionals, psychiatrists hold an MD or DO degree, which means they completed medical school and can prescribe medication. This medical training is the key distinction that sets them apart from psychologists, therapists, and counselors.
Education and Training
Becoming a psychiatrist requires at least 12 years of education after high school. The path starts with a four-year undergraduate degree, followed by four years of medical school. During medical school, psychiatrists-in-training study the same anatomy, pharmacology, and internal medicine as every other future physician. After earning their MD or DO, they enter a psychiatry residency that lasts 48 months, according to requirements set by the Accreditation Council for Graduate Medical Education.
During residency, psychiatrists learn to evaluate and treat the full range of mental health conditions. They train in hospital psychiatric units, outpatient clinics, emergency departments, and consultation services. After completing residency, they can seek board certification through the American Board of Psychiatry and Neurology by passing a rigorous exam. Some pursue additional fellowship training in a subspecialty, which adds one to two more years.
What Psychiatrists Treat
Psychiatrists manage some of the most complex conditions in medicine. Common ones include anxiety disorders (panic disorder, obsessive-compulsive disorder, phobias), depression, bipolar disorder, post-traumatic stress disorder, eating disorders, personality disorders, and psychotic disorders like schizophrenia. They also treat less widely known conditions such as dissociative disorders, body dysmorphic disorder, and somatic symptom disorder, where emotional distress manifests as physical symptoms.
Because they are trained as physicians, psychiatrists are especially important when mental health symptoms overlap with physical illness. Thyroid disease, hormonal changes, neurological conditions, and medication side effects can all mimic or worsen psychiatric symptoms. A psychiatrist’s medical background allows them to recognize these connections and coordinate treatment across both physical and mental health.
How Psychiatrists Diagnose
There is no blood test or brain scan that directly diagnoses a mental health disorder. Instead, psychiatrists rely on a thorough clinical evaluation. A first appointment typically involves an in-depth conversation covering your current symptoms, past psychiatric history, medical history, medications, family history of mental illness, and social circumstances like your living situation, relationships, and work life. They may also ask about your childhood development, substance use, and how you’ve handled major life stressors like job loss or grief.
Psychiatrists use the Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR) as their reference framework for identifying specific conditions. While no lab test confirms a psychiatric diagnosis, a psychiatrist may order blood work to rule out physical causes. For example, checking thyroid function or electrolyte levels can reveal whether a medical condition is driving symptoms like fatigue, mood swings, or anxiety. In some cases, brain imaging or neurological exams may be needed to rule out structural problems.
Treatment Options
Medication is one of the most recognized tools psychiatrists use. They prescribe and manage psychotropic medications, which the American Medical Association describes as some of the most powerful medications in modern medicine. These include antidepressants, mood stabilizers, antipsychotics, anti-anxiety medications, and stimulants for attention disorders. Psychiatrists monitor how these medications interact with each other and with any drugs you take for physical health conditions.
Many psychiatrists also provide psychotherapy (talk therapy), though some focus primarily on medication management and refer patients to psychologists or therapists for ongoing therapy sessions. In practice, the combination of medication and therapy is often more effective than either alone.
For people who don’t respond to standard treatments, psychiatrists can offer more advanced interventions. Transcranial magnetic stimulation (TMS) is an office-based treatment that uses magnetic pulses to stimulate specific brain areas. Sessions run 20 to 30 minutes, five days a week, for four to eight weeks. Electroconvulsive therapy (ECT) is a hospital-based procedure performed under general anesthesia, typically three times a week for up to four weeks, with each session requiring about an hour from start to recovery. These treatments are generally reserved for severe or treatment-resistant depression.
Psychiatrist vs. Psychologist
This is the most common source of confusion. Psychiatrists and psychologists both work in mental health, but their training and capabilities differ significantly. Psychiatrists earn medical degrees (MD or DO) and complete medical residencies. Psychologists earn doctoral degrees in psychology (PhD or PsyD), which involves four to six years of graduate study plus a one-year internship, but no medical school.
The practical difference comes down to prescribing authority. Psychiatrists can prescribe medication in all 50 states. Only six states currently allow psychologists to prescribe, and the scope of that authority is limited. If your condition is likely to benefit from medication, or if your symptoms are severe or complicated by other medical issues, a psychiatrist is typically the better starting point. Psychologists, on the other hand, often provide more frequent therapy sessions and specialize in psychological testing and assessment.
Many people see both. A psychiatrist might manage your medication while a psychologist provides weekly therapy.
Subspecialties in Psychiatry
After completing general psychiatry training, some psychiatrists specialize further. The American Board of Psychiatry and Neurology recognizes these formal subspecialties:
- Child and adolescent psychiatry: treats mental health conditions in young people from early childhood through the teen years
- Geriatric psychiatry: focuses on mental health in older adults, including dementia-related behavioral symptoms
- Addiction psychiatry: specializes in substance use disorders and their overlap with other mental health conditions
- Forensic psychiatry: works at the intersection of mental health and the legal system, including competency evaluations and criminal cases
- Consultation-liaison psychiatry: treats psychiatric symptoms in patients who are hospitalized for medical or surgical conditions
Access and Availability
Finding a psychiatrist can be challenging. As of 2023, there were roughly 52,000 active psychiatrists in the United States (excluding residents in training). That number falls well short of demand. About 40% of the U.S. population, around 137 million people, lives in an area designated as a Mental Health Professional Shortage Area by the federal government.
The shortage is projected to worsen. By 2038, the country could be short nearly 37,000 adult psychiatrists and 7,000 child and adolescent psychiatrists under current trends. If more people who need care actually sought it, those gaps would grow even larger. This shortage is a major reason wait times for a first psychiatric appointment can stretch weeks or months in many areas, and why telepsychiatry (video appointments) has become increasingly common as a way to expand access.