Alopecia Areata is an autoimmune condition that causes sudden hair loss, often in round patches. It occurs when the body's immune system mistakenly attacks hair follicles, leading to hair falling out. This condition can affect anyone, regardless of age or gender, and may also lead to complete hair loss, known as Alopecia Totalis. The exact cause of Alopecia Areata is not fully understood, but it is believed to involve genetic and environmental factors. While there is no cure, some treatments, such as corticosteroids, can help stimulate hair regrowth. The condition is generally not harmful to overall health.