Major depression is more than a temporary period of sadness. It is a pattern of emotional, physical, and cognitive symptoms that can interfere substantially with work, school, relationships, and everyday responsibilities. Understanding the major depression criteria can help you recognize when it may be time to request a professional evaluation. If you meet major depression criteria, consider self-help strategies to supplement treatment and build coping skills.
This information is educational and cannot establish a diagnosis. Only a qualified healthcare professional can determine whether someone has major depressive disorder and whether another condition or medical issue may better explain the symptoms.
What does MDD stand for?
MDD is the common medical abbreviation for major depressive disorder. You may also see the terms “major depression,” “clinical depression,” or “major depressive episode.” Clinicians use diagnostic criteria, including those described in the DSM-5, alongside a person’s history and current circumstances when evaluating depression.
DSM-5 criteria for a major depressive episode
In general, a major depressive episode involves five or more symptoms during the same two-week period. The symptoms must represent a change from the person’s previous functioning, and at least one of them must be either depressed mood or a marked loss of interest or pleasure.
Possible symptoms include:
- Depressed, empty, or irritable mood for much of the day
- Markedly reduced interest or pleasure in most activities
- Significant changes in appetite or weight that are not intentional
- Insomnia or sleeping much more than usual
- Observable restlessness or slowed movement and speech
- Fatigue or a noticeable loss of energy
- Feelings of worthlessness or excessive, inappropriate guilt
- Difficulty thinking, concentrating, or making decisions
- Recurring thoughts of death, suicidal thoughts, or a suicide attempt
The symptoms must cause clinically significant distress or impairment in important areas of life, such as relationships, employment, education, or self-care. A clinician also considers whether the symptoms could be caused by a substance, medication, or another medical condition. The overall history is important, including whether the person has ever experienced manic or hypomanic episodes, because that may point to a different mood disorder.
How major depression differs from ordinary sadness
Sadness and grief are normal human experiences, and difficult events can affect mood, sleep, motivation, and concentration. Depression is more likely to be considered when symptoms are persistent, broad in scope, and significantly impair functioning or well-being. Loss of interest and pleasure, severe hopelessness, marked withdrawal, or thoughts of death deserve particular attention even when a person can still meet some daily obligations.
A self-checklist can help someone describe what has been happening, but it should not be used to confirm or rule out MDD. A primary care clinician, psychiatrist, psychologist, or other qualified professional can assess symptoms, duration, safety concerns, medical history, and possible alternative explanations. When reviewing major depression criteria, consider how nostalgia-related symptoms may overlap with persistent sadness and impairment.
Recurrent depression and severity terms
Some people experience one depressive episode, while others have episodes at different points in life. Recurrent major depressive disorder refers to a pattern involving more than one major depressive episode, with a period between episodes when full major-depression criteria are not present. Clinical records may describe this as “major depressive disorder, recurrent.”
Clinicians may also describe an episode as mild, moderate, or severe. These labels reflect factors such as the number and intensity of symptoms and the degree of impairment. A moderate episode can still be profoundly disruptive, while severe depression may involve extreme functional decline or psychotic features. The label does not determine how seriously a person’s suffering should be taken.
What to do if the criteria seem familiar
Consider arranging a professional assessment if symptoms have lasted around two weeks, are worsening, or are making ordinary responsibilities difficult. Before an appointment, it may help to note:
- When the symptoms began and whether they are present most days
- Changes in sleep, appetite, energy, concentration, and activity
- How symptoms are affecting work, school, relationships, or self-care
- Current medications, substance use, and relevant medical history
- Any thoughts of self-harm, suicide, or not wanting to live
Treatment may include psychotherapy, medication, or a combination of approaches. Regular sleep, gentle physical activity, structured routines, mood tracking, and connection with supportive people can complement professional care, but self-help should not replace evaluation when symptoms are severe or persistent.
Urgent safety concerns
If someone has suicidal thoughts, feels unable to stay safe, has made an attempt, or may harm another person, seek immediate help through local emergency services or a crisis service. Do not leave the person alone if there is imminent danger. When possible, involve a trusted person and remove immediate access to means of harm while urgent support is being arranged.
