Seasonal Affective Disorder (SAD) is a type of depression that occurs at the same time each year, usually in the fall and winter months. SAD is thought to be caused by a combination of factors, including reduced sunlight during the winter months, changes in the levels of certain chemicals in the brain, and changes in the body’s internal clock. Symptoms of SAD include feelings of sadness or hopelessness, loss of interest in activities, low energy, difficulty concentrating, changes in appetite and sleep patterns, and feelings of worthlessness or guilt. If you think you may have SAD, it’s important to talk to a doctor or mental health professional for a proper diagnosis and treatment.