Major Depressive Disorder (MDD): Symptoms, Diagnosis & Treatment Approaches
Major depressive disorder is a common mental health condition involving persistent changes in mood, interest, thinking, sleep, appetite, energy, or daily functioning. This guide explains commonly recognized symptoms, how MDD is evaluated, and treatment approaches you may encounter when exploring depression-focused care.
- DSM-5-TR diagnostic criteria
- Common symptoms & signs
- Treatment approaches
U.S. adults experienced a major depressive episode in 2021.
Source: NIMH, 2021Of U.S. adults experienced a major depressive episode in 2021.
Source: NIMH, 2021Of adults with a major depressive episode received treatment in 2021.
Source: NIMH, 2021Understanding Major Depressive Disorder: More Than Temporary Sadness
Major depressive disorder (MDD) is a mood disorder that can affect emotions, thinking, physical functioning, relationships, and everyday activities. It is more than a short period of sadness and may involve persistent changes in mood or loss of interest or pleasure along with changes in sleep, appetite, energy, concentration, movement, or feelings of worthlessness or guilt.
Depression can develop for many reasons, including a combination of biological, psychological, and social factors. Research continues to examine how brain circuits, neurotransmitter systems, genetics, stress, medical conditions, and other factors may contribute to depression. There is no single brain-imaging finding that is used by itself to diagnose MDD.
Common Symptoms Used to Evaluate MDD
DSM-5-TR criteria for a major depressive episode include nine possible symptoms. Five or more symptoms must be present during the same 2-week period, nearly every day, and at least one must be depressed mood or loss of interest or pleasure. Symptoms must also be associated with clinically significant distress or impairment, and a clinician considers other possible explanations before making a diagnosis.
Depressed Mood
Persistent sadness, emptiness, or depressed mood for much of the day.
Loss of Interest or Pleasure
Markedly reduced interest or pleasure in most activities.
Sleep Changes
Insomnia or sleeping more than usual.
Appetite or Weight Changes
Significant changes in appetite or weight that are not intentionally caused by dieting.
Psychomotor Changes
Observable agitation or slowing of movement or speech.
Fatigue or Low Energy
Persistent tiredness or reduced energy.
Feelings of Worthlessness or Excessive Guilt
Persistent feelings of worthlessness or excessive or inappropriate guilt.
Difficulty Concentrating or Making Decisions
Reduced ability to think, concentrate, remember, or make decisions.
Thoughts of Death or Suicide
Recurrent thoughts of death, suicidal thoughts, or suicidal behavior.
Clinical note: MDD is diagnosed based on a combination of symptoms, their duration, severity, and impact on daily functioning. Not everyone experiences every symptom, and having one or more of these symptoms does not necessarily mean a person has MDD. A qualified healthcare professional can determine whether symptoms meet diagnostic criteria.
Treatment Approaches Commonly Used for MDD
Treatment options vary based on symptoms, severity, medical history, previous treatment, preferences, and other individual factors. A qualified healthcare professional determines which approaches may be appropriate.
Antidepressant Medication
Antidepressant medications are commonly used to treat depression. A clinician considers symptoms, medical history, other medications, side effects, and previous treatment response when selecting and adjusting medication.
Learn about medication managementPsychotherapy
Evidence-based psychotherapies, including cognitive behavioral therapy (CBT) and interpersonal therapy (IPT), can help address depressive symptoms, thinking patterns, behaviors, relationships, and coping strategies.
Explore psychotherapyRepetitive Transcranial Magnetic Stimulation (rTMS)
rTMS uses repeated magnetic pulses to stimulate specific brain regions involved in mood regulation. It is an FDA-cleared treatment for certain depressive conditions and is commonly considered when medication has not provided sufficient benefit or has not been well tolerated.
Learn about rTMSEsketamine (Spravato®)
An intranasal medication used in specific clinical situations, including treatment-resistant depression. It is administered under healthcare-professional supervision and has specific safety and monitoring requirements.
Learn about esketamineHow MDD Is Commonly Evaluated and Managed
Evaluation and management of MDD typically involve assessing symptoms, their duration and severity, overall health, treatment history, and individual circumstances. Treatment decisions are made by qualified healthcare professionals based on each person's needs.
Clinical Evaluation
A healthcare professional may assess symptoms, duration, severity, functioning, medical history, and other relevant factors.
Treatment Planning
A healthcare professional may discuss treatment options based on symptoms, preferences, medical history, previous treatment, and individual circumstances.
Treatment Follow-Up
Follow-up appointments may be used to assess symptoms, side effects, response to treatment, and changes in functioning.
Ongoing Management
Treatment may be adjusted over time based on response, recurrence, side effects, and individual circumstances.
Explore MDD Clinics in Your Area
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Directory note: Clinic information can vary by location and may change over time. Contact the clinic directly to confirm services, availability, insurance participation, and whether a specific treatment is offered.
Frequently Asked Questions
Educational answers about MDD diagnosis, treatment approaches, and what to expect when exploring care.
What distinguishes major depressive disorder from temporary sadness?
Everyone experiences sadness and difficult periods. MDD involves a pattern of depressive symptoms that persists and causes clinically significant distress or impairment. Diagnosis is based on a clinical evaluation rather than simply how sad someone feels.
When does depression meet the diagnostic threshold for MDD?
MDD generally involves at least five symptoms occurring during the same 2-week period, including either depressed mood or loss of interest or pleasure. Symptoms must be associated with clinically significant distress or impairment, and other possible explanations are considered as part of a clinical evaluation.
What does “treatment-resistant depression” mean?
Treatment-resistant depression generally refers to depression that has not improved adequately after one or more appropriate treatment attempts. Definitions can vary, and clinicians consider factors such as the diagnosis, treatment type and dose, duration, adherence, side effects, and treatment response.
Does treatment always involve medication?
No. Treatment may involve psychotherapy, medication, or a combination of approaches. The appropriate approach depends on symptom severity, treatment history, medical factors, preferences, and other individual circumstances.
How long does depression treatment take?
There is no single timeline that applies to everyone. Some people notice improvement earlier, while others require changes in treatment or longer-term care. Clinicians typically monitor symptoms and functioning over time to determine whether treatment is helping.
Can depression return after symptoms improve?
Yes. Depression can recur for some people. Ongoing follow-up, continuation of effective treatment when recommended, and attention to early changes in symptoms can be part of longer-term management.
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MDDCare is a clinic directory and educational resource. Treatment decisions are made with qualified healthcare professionals.
Medical information disclaimer: MDDCare is an informational clinic directory. The information on this page is for educational purposes and is not medical advice, diagnosis, or treatment. MDDCare does not provide medical care or determine which treatment is appropriate for an individual. Always consult a qualified healthcare professional for personal medical guidance.
Clinical Sources: NIMH — Major Depression StatisticsNIMH — DepressionFDA — Spravato Prescribing Information988 Lifeline