Who's who
Psychiatrist vs. Psychologist vs. Therapist: Who Does What?
Medically reviewed · Updated 2026
The titles blur together, the roles overlap, and no one hands you a chart. Here's the clear version — what each professional actually does, and who to call first depending on what you need.
Psychiatrist — the one who prescribes
A psychiatrist is a medical doctor (MD or DO) who specialized in mental health. They can diagnose conditions, order tests, and — crucially — prescribe and manage medication. Appointments are often shorter and medication-focused; many psychiatrists don't provide weekly talk therapy themselves.
See a psychiatrist when: medication is likely part of the picture, or when symptoms are severe or complex.
Psychologist — therapy and testing
A psychologist typically holds a doctorate (PhD or PsyD). They provide psychotherapy and are the professionals who conduct in-depth psychological testing (for ADHD, learning differences, or diagnostic clarity). In most states they do not prescribe medication.
See a psychologist when: you want therapy from a doctoral-level clinician, or you need formal testing.
Therapist — the broad, essential category
"Therapist" covers several master's-level licensed professionals who provide talk therapy: Licensed Professional Counselors (LPC), Licensed Clinical Social Workers (LCSW), and Marriage and Family Therapists (LMFT). They are, for most people, the front door to ongoing weekly therapy — skilled, accessible, and often more available than doctoral clinicians.
See a therapist when: you want regular talk therapy — which is the most common need.
Not sure where to start?
If you're unsure, starting with a therapist or your primary care physician is rarely wrong — either can help you figure out whether medication or testing belongs in the plan and refer you onward. Mental Health Guide lays out these roles and the treatment approaches each uses, so you walk into that first call already knowing who you're talking to.
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General educational information only. This does not provide medical advice, diagnosis, or treatment recommendations. Always consult a qualified healthcare provider. If you are in crisis, call or text 988 (US Suicide & Crisis Lifeline).