What causes patchy hair loss and how can it be treated?

Q: What causes patchy hair loss and how can it be treated?

Patchy hair loss is often caused by **alopecia areata**, an autoimmune condition in which the immune system mistakenly attacks hair follicles. This leads to smooth, round bald patches on the scalp or other areas of the body. Common treatments include corticosteroid injections, topical medications, and immunotherapy to encourage hair regrowth. Other causes of patchy hair loss can include fungal infections (like ringworm), traction alopecia, or trichotillomania. Because patchy hair loss can stem from several very different conditions—each requiring a different treatment approach—identifying the underlying cause early is key to getting the right care and improving your chances of regrowth. A free, instant, online symptom check can help you quickly narrow down possible causes based on your specific symptoms and guide you on the next steps, whether that's seeing a dermatologist or monitoring at home. Reviewed for medical accuracy: 07/15/2026

Reviewed by Yoshinori Abe, MD

Internal Medicine

Patchy hair loss is often caused by alopecia areata, an autoimmune condition in which the immune system mistakenly attacks hair follicles. This leads to smooth, round bald patches on the scalp or other areas of the body. Common treatments include corticosteroid injections, topical medications, and immunotherapy to encourage hair regrowth. Other causes of patchy hair loss can include fungal infections (like ringworm), traction alopecia, or trichotillomania.

Because patchy hair loss can stem from several very different conditions—each requiring a different treatment approach—identifying the underlying cause early is key to getting the right care and improving your chances of regrowth. A free, instant, online symptom check can help you quickly narrow down possible causes based on your specific symptoms and guide you on the next steps, whether that's seeing a dermatologist or monitoring at home.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Alopecia areata is a condition that causes patchy hair loss. It occurs when the body's immune system mistakenly attacks hair follicles, leading to hair falling out in small, round patches.

Causes

Autoimmune Reaction: The immune system attacks hair follicles.

Treatments

Corticosteroids: These are medicines that help reduce inflammation and can be applied directly to the skin or injected.
Topical Immunotherapy: This involves applying chemicals to the scalp to provoke an allergic reaction, which can help hair regrow.
Minoxidil: A topical treatment that can help stimulate hair growth.

While there is no cure for alopecia areata, these treatments can help manage the condition and promote hair regrowth. If you're experiencing unusual hair loss or other concerning symptoms, try our free AI-powered symptom checker to better understand what might be happening, then discuss with a healthcare provider to find the best treatment plan.

(References)

Pratt CH, King LE Jr, Messenger AG, Christiano AM, & Sundberg JP. (2017). Alopecia areata. Nature reviews. Disease primers, 28300084.
Abarca YA, Scott-Emuakpor R, Tirth J, Moroz O, Thomas GP, Yateem D, et al. (2025). Alopecia Areata: Understanding the Pathophysiology and .... Cureus, 40026917.
Lintzeri DA, Constantinou A, Hillmann K, Ghoreschi K, Vogt A, & Blume-Peytavi U. (2022). Alopecia areata - Current understanding and management. Journal der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG, 35040577.

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