What condition is characterized by hair loss?

The condition characterized by hair loss is alopecia. Alopecia can manifest in various forms, including total hair loss on the scalp (alopecia areata) or thinning hair (androgenetic alopecia). The underlying causes can vary widely, encompassing genetic factors, autoimmune disorders, hormonal changes, and nutritional deficiencies.

In contrast, hirsutism refers to excessive hair growth in areas where men typically grow hair, which is unrelated to hair loss. Dandruff is a common scalp condition that leads to flaking and itching but does not cause hair loss. Pediculosis, commonly known as head lice, involves an infestation of the scalp and can lead to itching and irritation but does not directly cause hair loss. Understanding these distinctions is crucial in recognizing the specific characteristics and implications of each condition.