SAD is a type of depression that follows a seasonal pattern, most commonly beginning in the fall and continuing through the winter months. It is linked to reduced exposure to natural light, which can disrupt the body’s internal clock and affect mood-regulating chemicals. People with SAD may experience low energy, changes in sleep and appetite, difficulty concentrating, and a desire to withdraw from social activities. These symptoms can impact daily life and emotional well-being. Without support, SAD can return each year and become a recurring struggle.