Thinning hair refers to a gradual reduction in the density of hair on the scalp, which can affect both men and women. This condition can be caused by various factors, including genetics, hormonal changes, nutritional deficiencies, and certain medical conditions. It often leads to a more noticeable scalp and can impact self-esteem. There are different types of thinning hair, such as androgenetic alopecia, commonly known as male or female pattern baldness. Other causes may include telogen effluvium, which is temporary hair loss due to stress or illness, and alopecia areata, an autoimmune disorder. Treatments vary and may include medications, lifestyle changes, or hair restoration procedures.