Alopecia is a condition characterized by partial or complete hair loss, which can affect the scalp or other parts of the body. It may result from genetic factors, hormonal changes, autoimmune conditions, stress, nutritional deficiencies, or medical treatments. Common types include alopecia areata, androgenetic alopecia, and telogen effluvium. While hair loss can be temporary or permanent depending on the cause, early diagnosis and appropriate treatment can help manage the condition, stimulate hair regrowth in some cases, and support overall scalp and hair health.