Roughly 17.5 million people worldwide had alopecia areata in 2021, the autoimmune form of hair loss that causes patchy or complete baldness. In the United States alone, about 7 million people are currently affected. But alopecia areata is just one type. When you include pattern hair loss, the most common form, the numbers are dramatically larger: an estimated 80 million men and women in the U.S. experience it.
Alopecia Areata: The Autoimmune Type
Alopecia areata occurs when the immune system mistakenly attacks hair follicles, causing hair to fall out in round patches on the scalp, face, or body. About 2% of people worldwide will experience it at some point in their lifetime, and the condition can strike at any age. Nearly 1 in 5 cases begins in childhood: among all dermatology patients diagnosed with alopecia areata, about 18% are under 18.
The prevalence appears to be rising. U.S. data show that the rate climbed from about 0.20% of the population in 2016 to 0.22% in 2019. That may sound like a tiny shift, but across a population of over 330 million people, it translates to tens of thousands of additional cases each year. The overall incidence in 2019 was roughly 93 new cases per 100,000 people annually.
Severe Forms Are Less Common
Most people with alopecia areata lose hair in patches. The more severe forms, alopecia totalis (complete scalp hair loss) and alopecia universalis (loss of all body hair), account for about 5% to 10% of all cases. The prevalence of these severe forms also increased between 2016 and 2019, rising from 0.012% to 0.019% of the population. That still makes total or universal hair loss quite rare, affecting roughly 1 in 5,000 people.
Pattern Hair Loss Affects Millions More
The type of hair loss most people picture, a receding hairline or thinning crown, is androgenetic alopecia, commonly called male or female pattern hair loss. It is far more widespread than the autoimmune form. The National Institutes of Health estimates it affects about 50 million men and 30 million women in the United States.
Pattern hair loss can begin as early as the teenage years, and it becomes more likely with age. More than half of men over 50 have some degree of it. In women, noticeable thinning is most common after menopause, though it can start earlier. Unlike alopecia areata, pattern hair loss is driven by genetics and hormones rather than an immune system malfunction.
Traction Alopecia and Styling-Related Loss
Traction alopecia, hair loss caused by repeated pulling from tight hairstyles, is a significant concern for women with Afro-textured hair. In a study of 874 adults in South Africa, 32% of women had detectable traction alopecia compared with just 2% of men. Among schoolgirls, the prevalence increased with age: 9% of girls aged six to seven showed signs, rising to 22% by ages 17 to 21. This type of hair loss is entirely preventable if caught early, but it can become permanent once the follicles are scarred.
Who Is Most Likely to Be Affected
Alopecia areata does not affect all demographic groups equally. Analysis of U.S. dermatology visit data found that Black individuals, Latino individuals, and non-White individuals overall were significantly more likely to visit a dermatologist for alopecia areata. Latino patients were about 2.5 times more likely than non-Latino patients to be seen for the condition, and non-White patients were roughly 2.4 times more likely than White patients. These differences could reflect higher disease rates, more severe disease prompting medical visits, or both.
The condition affects men and women at similar rates, though women tend to seek treatment more often. Children make up a meaningful share of cases, with nearly 1% of all pediatric dermatology patients carrying an alopecia areata diagnosis.
The Mental Health Toll
Hair loss carries a psychological burden that the raw numbers don’t capture. Adults with alopecia areata are 30% to 38% more likely to be diagnosed with depression than adults without the condition. About one-third of adults with alopecia areata also have anxiety. These rates hold even for people with relatively mild, patchy hair loss, suggesting that the emotional weight of the condition is not purely tied to how much hair someone has lost. The unpredictability of flare-ups, the visibility of the condition, and the social stigma around baldness (particularly for women and children) all contribute.
Putting the Numbers Together
If you combine every form of alopecia, the total number of affected people is staggering. In the U.S. alone, pattern hair loss accounts for roughly 80 million cases, alopecia areata for about 7 million, and traction alopecia and scarring types for millions more, though precise global figures for those categories are harder to pin down. Worldwide, alopecia areata alone affects over 17.5 million people at any given time, and that number is projected to keep climbing through 2050. When all types are counted together, hair loss is one of the most common conditions in dermatology, touching hundreds of millions of people globally.