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Published on: 8/20/2026
Alopecia areata is an autoimmune condition that causes hair to fall out in small patches or, in more severe cases, across the entire scalp and body. It occurs when the immune system mistakenly attacks hair follicles, disrupting normal hair growth. The condition can affect people of any age, gender, or ethnicity, and hair loss may be sudden or gradual. While some individuals experience regrowth, others may have recurring episodes.
If you're noticing unexplained hair loss or bald patches, understanding the cause early is key to managing it effectively. Take a free, instant, online symptom check to explore what may be behind your symptoms and get clear guidance on your next steps. It's quick, private, and could help you make informed decisions about your health.
Reviewed for medical accuracy: 07/15/2026
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Alopecia areata is a condition where hair falls out in small patches, and it can sometimes lead to complete hair loss on the scalp or body. This happens because the immune system mistakenly attacks the hair follicles, where hair grows.
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Sometimes, people with alopecia areata may see their hair grow back, but it can fall out again. If you're experiencing unexpected hair loss or other symptoms that concern you, try Ubie's free AI symptom checker to better understand what might be happening and when to seek medical care. Researchers are still studying why this happens and how to help hair grow back more reliably.
(References)
Fiedler VC, & Alaiti S. (1996). Treatment of alopecia areata. Dermatologic clinics, 9238331.
Delamere FM, Sladden MM, Dobbins HM, & Leonardi-Bee J. (2008). Interventions for alopecia areata. The Cochrane database of systematic reviews, 18425901.
Osman S, & Traboulsi D. (2023). A case report on secondary hair growth in alopecia .... SAGE open medical case reports, 36744055.
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