Alopecia Areata: Causes, Regrowth and Treatment

Alopecia areata is an autoimmune condition in which the immune system attacks growing hair follicles, causing round, smooth patches of hair loss. It affects about 2% of people at some point in their lives, at any age and in both sexes. Because the follicle isn't destroyed, hair often grows back, but the course is unpredictable. A dermatologist can confirm it and discuss treatment, including newer JAK inhibitor tablets for severe cases.

This guide covers the signs, what triggers it, whether hair grows back, the treatments with the best evidence, and what you can do.

Key fact: Alopecia areata is non-scarring. The follicle stays alive under attack, so it can start producing hair again, even after years.

What Does Alopecia Areata Look Like?

• Patchy alopecia areata, the most common form: one or more round or oval smooth patches.
• Exclamation-mark hairs: short broken hairs that narrow toward the root, often at the edge of a patch.
• Alopecia totalis: loss of all scalp hair.
• Alopecia universalis: loss of all scalp and body hair.
• Diffuse alopecia areata: sudden all-over thinning, which can look like other types of shedding.
• Nail changes, such as small pits, in some people.

What Triggers Alopecia Areata?

The immune system loses its usual tolerance of the hair follicle and attacks it during the growth phase. Genes play a big part: many susceptibility genes have been found, and it often runs in families. People often notice a flare after stress or illness, but a clear trigger isn't always found. It's more common in people with other autoimmune conditions such as thyroid disease or vitiligo, and in people with eczema, asthma or allergies.

Does Hair Grow Back From Alopecia Areata?

Often, yes. Small patches frequently regrow, sometimes on their own within months, and regrowing hair may be white or fine at first. The course is unpredictable, though, and new patches can appear as old ones recover. Extensive loss, loss starting in childhood, and loss around the edge of the scalp are harder to treat.

How to Stop Alopecia Areata From Spreading

There's no proven way to prevent new patches, but early treatment by a dermatologist can help regrowth and may limit how far it goes. Things you can do:

• See a dermatologist early, especially if patches are spreading or you're losing brow or lash hair.
• Get checked for related conditions, such as thyroid disease, if your doctor suggests it.
• Protect exposed skin from the sun, and consider brow pencils, wigs or hairpieces if they help you feel more comfortable.
• Look after your mental health. Hair loss can be distressing, and support groups and counseling help many people.

What Is the Best Way to Treat Alopecia Areata?

Treatment depends on how much hair is affected:

• Limited patches: corticosteroid injections into the patches are often first-line for adults, along with steroid creams or lotions.
• More extensive loss: options include topical immunotherapy and, for severe cases, oral JAK inhibitors, a newer class of drugs that calm the immune signals attacking the follicle.
• Minoxidil is sometimes used alongside other treatments.

All of these need a doctor's supervision. Natural remedies and supplements haven't been shown to treat alopecia areata.

What Can Be Mistaken for Alopecia Areata?

Fungal scalp infection (tinea capitis), hair pulling (trichotillomania), traction alopecia and early scarring alopecias can all cause patches. A dermatologist can tell them apart, sometimes with a closer look at the scalp or a small biopsy. Types of alopecia.

What the Research Shows

A 2017 review in Nature Reviews Disease Primers (Pratt et al.) describes alopecia areata as an autoimmune, non-scarring disorder that preserves the hair follicle. It affects nearly 2% of people during their lifetime, with patchy scalp loss the most common form. A breakdown of the follicle's immune privilege is thought to drive it, and genetic studies show it's a complex, polygenic disease.

A systematic review of its epidemiology (Villasante Fricke and Miteva, 2015) puts the lifetime risk at about 2% worldwide, with no difference between the sexes. First onset is most common in people's 20s and 30s, but can happen at any age, and earlier onset is linked to a higher risk of extensive disease. People with alopecia areata are at higher risk of depression, anxiety, allergic conditions, vitiligo, thyroid disease and other autoimmune conditions.

Two phase 3 trials of baricitinib, an oral JAK inhibitor (King et al., 2022), enrolled 1,200 adults with severe alopecia areata, with at least half the scalp affected. After 36 weeks, 38.8% and 35.9% of those on 4 mg had 80% or more scalp coverage, compared with 6.2% and 3.3% on placebo. Acne, raised creatine kinase and higher cholesterol were more common with the drug.

A Note on Products

Alopecia areata is a medical condition that needs a doctor's diagnosis and care. FullyVital's products are not treatments for it. If you're dealing with everyday thinning or shedding as well, see how to stop hair loss.

Frequently Asked Questions

What triggers alopecia areata?

An autoimmune attack on growing hair follicles, in people with a genetic tendency. Flares sometimes follow stress or illness, but often there's no clear trigger.

Does hair grow back from alopecia areata?

Often, especially in small patches, and sometimes without treatment. The course is unpredictable, and extensive or childhood-onset cases are harder to treat.

How do you stop alopecia areata from spreading?

There's no proven way to prevent new patches. See a dermatologist early, since treatment can help regrowth.

What is the best way to treat alopecia areata?

For small patches, steroid injections or creams are common. For severe cases, oral JAK inhibitors have shown regrowth in large trials. A dermatologist will recommend what fits your case.

Is alopecia areata caused by stress?

Stress may set off a flare in some people, but the underlying cause is autoimmune and genetic. Reducing stress alone doesn't treat it.