Hair growth disorders refer to conditions that affect the normal growth and health of hair. These disorders can lead to excessive hair loss, thinning hair, or abnormal hair growth patterns. Common types include androgenetic alopecia, which is hereditary hair loss, and alopecia areata, an autoimmune condition that causes sudden hair loss in patches. Other hair growth disorders may result from hormonal imbalances, nutritional deficiencies, or certain medical treatments. Conditions like telogen effluvium can cause temporary hair shedding due to stress or illness. Understanding these disorders is essential for effective treatment and management of hair health.