There are several different types of depression, each with unique symptoms and patterns of occurrence. Here are some of the most common types of depression:

1. Major depressive disorder: This is the most common type of depression and is characterized by symptoms such as persistent sadness, loss of interest in previously enjoyed activities, feelings of worthlessness, and difficulty sleeping or concentrating. These symptoms must be present for at least two weeks to be considered major depressive disorder.

2. Persistent depressive disorder: This type of depression involves a longer-lasting depression that lasts for at least two years, although the symptoms may not always be severe. Individuals with persistent depressive disorder may experience loss of interest in daily activities and feelings of hopelessness or low self-esteem.

3. Bipolar disorder: Bipolar disorder is characterized by both depressive episodes and manic or hypomanic episodes, which involve periods of high energy, racing thoughts, and impulsive behavior.

4. Seasonal affective disorder: This type of depression typically occurs during the winter months when daylight hours are reduced. Symptoms may include feelings of lethargy, weight gain, and increased need for sleep.

5. Psychotic depression: This type of depression involves symptoms of depression combined with psychosis, such as hallucinations or delusions.

6. Premenstrual dysphoric disorder: This is a type of depression that occurs in some women before their menstrual period and includes symptoms such as irritability, mood swings, and feelings of hopelessness.

Treatment for depression may include therapy, medication, or a combination of both, depending on the type and severity of symptoms. It is important to seek the help of a healthcare professional for an accurate diagnosis and appropriate treatment.