Alopecia Areata: Symptoms, Causes, and Treatment

Alopecia areata causes unpredictable hair loss when the immune system attacks hair follicles. It often starts with small round bald patches but can progress to total hair loss. While not medically dangerous, it impacts quality of life. Treatments can help hair regrow, but cycles of loss and regrowth are common.

In plain words

Alopecia areata is a condition where your immune system attacks your hair by mistake. This causes hair to fall out in small, round patches. It can happen to anyone at any age. The hair loss is not painful but can be upsetting. Hair often grows back on its own, but treatment can help. There is no cure, but doctors have medicines that may help hair grow back.

What is Alopecia Areata: Symptoms, Causes, and Treatment?

Alopecia areata causes unpredictable hair loss when the immune system attacks hair follicles. It often starts with small round bald patches but can progress to total hair loss. While not medically dangerous, it impacts quality of life. Treatments can help hair regrow, but cycles of loss and regrowth are common.

Symptoms

Early symptoms

  • Small round bald patches: One or more coin-sized, smooth patches of hair loss appear suddenly, most often on the scalp. The skin looks normal without redness or scaling. (7) (9)
  • Exclamation mark hairs: Short hairs that taper at the base may be seen at patch edges, resembling exclamation marks. These are characteristic of active hair loss. (7)
  • Sudden hair shedding: Clumps of hair may come out during washing or brushing. The hair loss typically occurs over days to weeks rather than gradually. (1) (4)
  • Mild itching or tingling: Some people notice itching, burning, or tingling in the area before hair falls out. This occurs in about one-third of cases. (9)

Serious or emergency symptoms

  • Alopecia totalis: Complete loss of all scalp hair. This extensive form affects about 5% of people with alopecia areata. (9)
  • Alopecia universalis: Total loss of all body hair, including eyebrows, eyelashes, and pubic hair. This rare severe form affects both men and women. (9)
  • Nail changes: Pitting (tiny dents), ridges, or rough texture in fingernails or toenails. May be more common in severe cases. (9)
  • Multiple episodes: Hair regrows but falls out again in cycles. Many people experience multiple episodes over their lifetime. (4)

Causes

Primary causes

  • Autoimmune disorder: The immune system mistakenly attacks hair follicles, treating them as foreign invaders. This disrupts normal hair growth cycles. (3) (9)
  • Genetic predisposition: About 20% of affected individuals have a family history. Multiple genes appear to increase autoimmune risk when combined. (3)
  • Environmental triggers: Potential triggers in genetically susceptible people may include viral infections, trauma, or stress, though none are proven. (3) (1)

Risk factors

Family history

Having a relative with alopecia areata, especially a first-degree relative, increases your risk. (3)

Other autoimmune conditions

Conditions like thyroid disease, vitiligo, or type 1 diabetes make alopecia areata more likely. (3)

Asthma and allergies

People with atopic conditions (asthma, eczema, hay fever) have higher alopecia areata rates. (3)

Young age

Most cases begin before age 30, though onset can occur at any age. (3)

Diagnosis

Doctors typically diagnose alopecia areata by examining the hair loss pattern. They may gently pull hairs at patch edges to check for easy removal. Additional tests usually aren't needed, but sometimes a scalp biopsy confirms the diagnosis. Blood tests may check for related autoimmune conditions if other symptoms suggest them.

Visual examination

Characteristic round, smooth patches with exclamation mark hairs help confirm the diagnosis. (8)

Hair pull test

Gently pulling hair near bald spots checks for active disease by seeing if many hairs come out easily. (6)

Scalp biopsy (rare)

A small skin sample examined under a microscope shows immune cells attacking hair follicles when diagnosis is unclear. (6)

Treatment

Medication options

Corticosteroids

Calms inflammation around hair follicles. Injections every 4-6 weeks are first-line treatment for patchy hair loss. Topical creams/foams may be used between injections. (2) (5)

JAK inhibitors

These oral medications block immune system messengers involved in attacking hair follicles. Can produce significant hair regrowth in extensive cases. (5)

Topical immunotherapy

Applied chemicals provoke an allergic reaction to distract the immune system from attacking hair follicles. Used when other treatments fail in extensive cases. (2)

Lifestyle and self-care

  • Scalp protection: Use sun protection (hats, sunscreen) on bald areas to prevent sunburn, especially early in regrowth when hair is sparse. (10)
  • Wigs or hair coverings: High-quality wigs, scarves, or hats can restore appearance while waiting for hair regrowth. Many feel more confident with coverings. (2)
  • Stress management: While not a direct cause, stress may trigger flares. Relaxation techniques or counseling help some people cope better. (10)
  • Support groups: Connecting with others facing similar challenges reduces isolation and provides practical coping tips. (2)

Always discuss dosing and treatment changes with your own prescriber.

Possible complications

  • Emotional distress: Hair loss often causes anxiety, depression, or social withdrawal, especially in young people and those with extensive loss. (9)
  • Eye irritation: Missing eyelashes or eyebrows may allow dust and sweat into eyes, causing irritation or infections in some cases. (9)
  • Sun sensitivity: Bald scalp areas burn more easily without hair's natural UV protection. Regular sun protection is important. (9)

When to see a doctor

Routine follow-up

  • Schedule an appointment when you first notice patchy hair loss to confirm the diagnosis and discuss treatment options early. (10)
  • See your doctor if existing patches grow larger or new patches appear, as treatment adjustments may be needed. (10)

Seek emergency care

  • Seek urgent care if hair loss occurs with scalp pain, redness, or pus, which may indicate a different condition requiring prompt treatment. (10)

Frequently asked questions

Does alopecia areata hurt?

Alopecia areata itself doesn't hurt, though some people feel mild itching or tingling before hair falls out. The scalp appears healthy without inflammation. Any pain, redness, or scaling suggests a different condition needing evaluation. (9)

Can children get alopecia areata?

Yes, alopecia areata commonly starts in childhood. About half of cases begin before age 20. Children experience the same symptoms as adults but may need extra emotional support from parents, teachers, and counseling. (3)

Will my hair grow back?

Hair often regrows within months to years, even without treatment, especially in mild cases. However, episodes of hair loss can recur throughout life. Treatments aim to speed regrowth when it doesn't happen naturally. (1)

Is alopecia areata genetic?

While not strictly inherited, genetic predisposition plays a strong role. About 20% of affected people have a family member with the condition, suggesting multiple genes contribute to autoimmune risk when combined with environmental factors. (3)

What's the latest treatment for severe cases?

JAK inhibitors like baricitinib are the newest FDA-approved treatment for moderate to severe alopecia areata. These oral medications can produce significant hair regrowth by blocking specific immune signals attacking hair follicles, though they require ongoing use. (5)

References

  1. NHS — Alopecia areata source 1
  2. NHS — Alopecia areata - Treatment source 2
  3. MedlinePlus — Alopecia areata source 3
  4. NAAF — What is Alopecia Areata? source 4
  5. NAAF — Treatment Options source 5
  6. NAAF — Diagnosis & Prognosis source 6
  7. AAD — Alopecia areata: Overview source 7
  8. AAD — Alopecia areata: Diagnosis and treatment source 8
  9. Mayo Clinic — Alopecia areata - Symptoms and causes source 9
  10. Cleveland Clinic — Alopecia Areata source 10