Clinical Depression (Major Depressive Disorder) is a mood disorder characterized by persistent symptoms affecting mood and daily functioning, as described by the National Institute of Mental Health (NIMH). A diagnosis is made by a licensed clinician using established criteria.
Situational Depression (Reactive Depression): short-term, stress-related depression symptoms that can develop after a difficult event or series of events. A clinician may describe this as an adjustment-related depressive presentation depending on symptoms and duration.
Topics Covered in This Article
- Depression: history, symptoms, and types
- How clinicians evaluate and diagnose major depression
- Treatment options for clinical depression
- Treating depression without medication
This article was medically reviewed by Dr. Troy Noonan, MD (Psychiatry).
Introduction
Sadness is a normal part of life. Periods of sadness can follow difficult experiences, like the death of a loved one, the loss of a job, or a debilitating accident.
But what is the difference between periods of sadness and an episode of major depressive disorder (clinical depression)? What are the other symptoms of clinical depression, and when should you consider a professional evaluation? More importantly, can short-term depression symptoms increase the likelihood of a later depressive episode in some people?
This article reviews definitions, common symptoms, and evidence-based treatment options.
Note: Throughout this article, the terms “clinical depression” and “major depressive disorder” may be used interchangeably. The terms “reactive,” “situational,” or “low-grade” depression are sometimes used informally to describe depressive symptoms that do not meet criteria for major depressive disorder.
Depression: History, Symptoms, and Types
Depression has been described across history and cultures. Earlier explanations often relied on spiritual or philosophical frameworks, while modern medicine recognizes depression as a health condition influenced by multiple factors.
Depression symptoms
Depression symptoms can vary by person. Common symptoms include:
- Low mood or persistent sadness
- Decreased energy or feeling slowed down
- Difficulty concentrating or remembering
- Difficulty making decisions
- Changes in sleep (insomnia or sleeping more than usual)
- Changes in appetite or weight
- Restlessness, anxiety, or irritability
- Reduced interest or pleasure in usual activities
- Social withdrawal
- Physical complaints (e.g., headaches, stomach issues) that may accompany mood symptoms
- Thoughts of death or suicide
If you or someone you know is having thoughts of self-harm or suicide, seek urgent help (call local emergency services or your local crisis line).
Terms commonly used for depressive presentations
Some terms you may hear in clinical settings include:
Seasonal pattern depression (Seasonal Affective Disorder): depressive episodes that occur at a particular time of year, most commonly in fall/winter, often improving in spring/summer.
Premenstrual Dysphoric Disorder (PMDD): a severe, cyclical pattern of mood symptoms that occurs in the luteal phase (the week or two before menstruation) and improves shortly after the start of menses.
Postpartum depression: major depression symptoms that occur during pregnancy or after delivery.
Persistent depressive disorder (dysthymia): a depressed mood lasting at least two years (with specific diagnostic features).
Depression with psychotic features: major depression accompanied by hallucinations or delusions (for example, mood-congruent beliefs about guilt, illness, or ruin).
Disruptive mood dysregulation disorder (pediatric): a childhood diagnosis characterized by severe, recurrent temper outbursts and persistent irritability.
Bipolar depression: depressive episodes that occur in bipolar disorder, typically alternating with manic or hypomanic episodes.
Depression vs. Clinical Depression: How Clinicians Diagnose Major Depressive Disorder
Clinical depression is not diagnosed solely by what “triggered” symptoms. Clinicians consider:
- Symptom type
- Symptom severity
- Duration
- Functional impairment
- Safety concerns (including self-harm risk)
- Medical causes, substance use, and medication effects
- History of manic or hypomanic symptoms (to rule out bipolar spectrum conditions)
A simplified view of diagnostic criteria
A clinician will typically assess whether a person has experienced a cluster of symptoms for at least two weeks, including either:
- Depressed mood most of the day, nearly every day, or
- Markedly reduced interest/pleasure in most activities
They also assess additional symptoms (such as sleep changes, appetite/weight changes, fatigue, slowed or agitated movement, concentration difficulties, feelings of worthlessness or excessive guilt, and recurrent thoughts of death or suicide), and whether symptoms cause significant impairment.
Self-assessments can be useful screening tools, but they do not diagnose depression.
Common clinical terms
- Episode: a period of time with symptoms meeting criteria (duration varies by condition)
- Recovery/Remission: a sustained period with minimal or no symptoms (clinicians define this in different ways depending on the context)
- Relapse/Recurrence: return of symptoms after improvement
Treatment Options for Clinical Depression
Treatment is individualized. Common evidence-based options include:
Psychotherapy
Therapy approaches may include cognitive behavioral therapy (CBT), interpersonal therapy (IPT), trauma-informed therapy when relevant, and other modalities based on needs and preferences.
Medication
Antidepressants are commonly prescribed and may include:
- SSRIs
- SNRIs
- Bupropion
- TCAs
- MAOIs
- Esketamine (for specific indications under medical supervision)
Medication selection depends on medical history, symptoms, side-effect profile, other medications, and response history.
When medication doesn’t help enough
Some people do not respond adequately to one or more medication trials. Clinicians may describe this as treatment-resistant depression and may consider additional strategies (dose optimization, psychotherapy integration, medication changes/augmentation, or neuromodulation options).
Treating Clinical Depression Without Medication
There are non-medication treatment options that may be appropriate for some patients, depending on diagnosis and clinical history.
Transcranial Magnetic Stimulation (TMS)
TMS is a non-invasive neuromodulation treatment cleared by the U.S. Food and Drug Administration (FDA) for certain conditions, including major depressive disorder. It is performed in an outpatient setting and does not require anesthesia.
- Sessions are typically scheduled multiple times per week over several weeks.
- People may experience side effects such as scalp discomfort or headache; serious adverse events are uncommon but can occur.
TMS is sometimes confused with ECT, but these are different treatments with different procedures and risk profiles.
Conclusion
Depressive symptoms can range from short-term, stress-related episodes to major depressive disorder that significantly affects daily functioning. If symptoms persist, worsen, or interfere with your life, a psychiatric evaluation can help clarify what’s happening and what treatment options may fit.
