Question:easy
Alopecia areata is a/an?
Alopecia areata is a/an?
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T cells attack hair follicles, linked with thyroid disease and vitiligo.
Updated On: Jun 24, 2026
- Autoimmune disorder
- Allergic disorder
- Anaphylactic disorder
- Bacterial infection
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The Correct Option is A
Solution and Explanation
Step 1: Picture the lesion - smooth, coin-shaped bald patches that appear quickly without scarring, sometimes ringed by tapering exclamation mark hairs.
Step 2: The mechanism behind these patches is immune. The hair follicle normally enjoys immune privilege, but in alopecia areata that protection breaks down and cytotoxic T cells swarm the follicle bulb, switching off active hair growth. This is an autoimmune attack.
Step 3: Supporting evidence is its frequent company with thyroid autoimmunity, vitiligo and pernicious anemia, and the fact that hair can regrow because the follicles survive.
Step 4: Since there is no allergic, anaphylactic or bacterial cause, alopecia areata is classed as an autoimmune disorder.
\[\boxed{\text{Autoimmune disorder}}\]
Step 2: The mechanism behind these patches is immune. The hair follicle normally enjoys immune privilege, but in alopecia areata that protection breaks down and cytotoxic T cells swarm the follicle bulb, switching off active hair growth. This is an autoimmune attack.
Step 3: Supporting evidence is its frequent company with thyroid autoimmunity, vitiligo and pernicious anemia, and the fact that hair can regrow because the follicles survive.
Step 4: Since there is no allergic, anaphylactic or bacterial cause, alopecia areata is classed as an autoimmune disorder.
\[\boxed{\text{Autoimmune disorder}}\]
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