Depression- Symptoms, causes and treatment

What are the three most important characteristics of depression? How does depression develop and what's its typical course? What age and gender are most affected by depression? What are the major causes and common triggers of depression? How is depression diagnosed, and what's the gold standard of treatment? What are the different types of depression, and how do they differ? How does depression associate with chronic illnesses? What's the effectiveness of first-line and second-line treatments? What are the long-term prognosis and quality of life for those with depression? What is the historical perspective of depression and its societal impact? Important Highlights: Depression affects over 4% of the population and is a leading cause of disability worldwide. Persistent sadness, loss of interest, and physical symptoms are key characteristics of depression. Causes include serotonin level decline, genetic factors, and environmental stressors. Women experience depression twice as often as men, and it's common after late teens. Major types include Major Depressive Disorder, Persistent Depressive Disorder, Bipolar Disorder, Seasonal Affective Disorder, and Postpartum Depression. Diagnosis requires at least five specific symptoms over a two-week period. First-line treatment like SSRIs is 40-60% effective; second-line like SNRIs has similar rates. Association with chronic illnesses: 40% with major chronic illnesses experience depression. The prognosis shows that 60-70% can expect significant improvement with treatment. Depression was once referred to as "melancholia" and misunderstood as a sign of weakness.