Depression isn’t just one condition—it comes in several forms. Understanding the types helps with proper diagnosis and treatment. Here are four common types of depression.

1. Major Depressive Disorder (MDD)
This is the most well-known type of depression. It involves persistent sadness, loss of interest, and fatigue lasting at least two weeks. MDD can interfere with work, sleep, and daily life. Episodes may happen once or recur over time.

2. Persistent Depressive Disorder (Dysthymia)
This is a milder but longer-lasting form of depression. Symptoms last for two years or more in adults. People with dysthymia may feel “down” most days but still function. Without treatment, it can lead to major depressive episodes.

3. Bipolar Disorder (Depressive Phase)
Bipolar disorder includes both manic (high-energy) and depressive episodes. The depressive phase mimics major depression. Accurate diagnosis is key—treating it like regular depression without mood stabilizers can worsen mania.

4. Seasonal Affective Disorder (SAD)
SAD is a type of depression tied to seasonal changes. It usually starts in late fall or early winter and lifts in spring. Reduced sunlight affects mood-regulating chemicals like serotonin and melatonin. Light therapy often helps.

Each type of depression responds best to specific treatments. These may include therapy, medication, lifestyle changes, or light therapy. Recognizing the right type leads to better outcomes.

If you or someone you know shows signs of any type of depression, reach out to a mental health professional. All forms are treatable—with the right support, recovery is possible.

Knowing the types of depression is the first step toward effective care.