Major Depressive Disorder (Depression)

Major Depressive Disorder (MDD), commonly called depression, is a serious mood disorder that causes persistent feelings of sadness, hopelessness, and loss of interest in activities once enjoyed. It affects how you feel, think, and handle daily activities such as sleeping, eating, and working. **Depression is more than just sadness:** - Normal sadness is temporary and tied to specific events - Depression persists for weeks or months - Depression affects your ability to function - Depression often has no clear external cause **Types of Depression:** - **Major Depressive Disorder**: Symptoms most of the day, nearly every day, for 2+ weeks - **Persistent Depressive Disorder (Dysthymia)**: Milder but chronic symptoms lasting 2+ years - **Seasonal Affective Disorder (SAD)**: Depression tied to seasonal changes - **Postpartum Depression**: Depression following childbirth - **Bipolar Depression**: Depressive episodes in bipolar disorder **The Experience of Depression:** Depression is not a choice or a sign of weakness. It is a medical condition affecting brain chemistry, structure, and function. People with depression cannot simply "snap out of it" or "think positive." It requires treatment like any other medical condition.

Depression results from a complex interaction of biological, psychological, and social factors: **Biological factors:** - Neurotransmitter imbalances (serotonin, norepinephrine, dopamine) - Genetic predisposition (depression runs in families) - Changes in brain structure (smaller hippocampus, altered prefrontal cortex) - Hormonal changes (thyroid problems, menopause, postpartum) - Chronic inflammation in the body - Disrupted circadian rhythms **Psychological factors:** - Negative thinking patterns - Low self-esteem - Perfectionism and self-criticism - Rumination (dwelling on problems) - History of trauma or abuse **Social and environmental factors:** - Major life changes or losses - Chronic stress - Social isolation - Relationship problems - Financial difficulties - Childhood adversity **The Downward Spiral:** Depression creates a self-reinforcing cycle: low mood leads to withdrawal and inactivity, which leads to less reward and pleasure, which deepens the depression.