Hair strands may be dead, but the tiny organs beneath them are very much alive, and understanding how they respond to stress could help prevent one of the world’s most common forms of hair loss – alopecia.

Across Ghana, getting your hair braided is as much a social ritual as it is a hairstyle. Whether in a neighbourhood salon, a university hall of residence or at home with a trusted braider, the experience is a familiar one for many. A tight scalp, watering eyes and a few days of tenderness are often accepted as simply part of the process. Most of the time, the discomfort passes. Sometimes, the damage doesn’t.

What many people don’t realise is that while a hairstyle may last only a few weeks, the living tissue beneath the scalp keeps responding to that stress long after the braids come out. Every pull, every tightly secured plait and every style that leaves the scalp painfully tender places mechanical stress on the hair follicle. The strands we brush, braid and style are made of dead keratin, but each one begins life inside a remarkably complex structure. Hair follicles are far more than simple holes in the skin; they are miniature organs, packed with stem cells, blood vessels, nerves, immune cells and pigment-producing cells that work together to produce healthy hair throughout our lives.

Like every other living tissue in the body, hair follicles can be injured. That simple biological fact helps explain why one of the most common forms of hair loss often begins not with disease, but with everyday habits. Known as traction alopecia, the condition develops when repeated tension places more stress on the follicle than it can continually repair. Understanding how this happens may be one of the simplest ways to protect long-term hair health.

Every hair follicle tells a biological story

Hair does not grow continuously. Each follicle instead cycles through phases of growth, transition, rest and shedding before starting the process again. Under normal conditions, stem cells within the follicle replace old cells with new ones, allowing healthy hair to regenerate over many years.

This process depends on a carefully balanced microenvironment. Blood vessels supply oxygen and nutrients, immune cells help maintain healthy tissue, and chemical signals coordinate when hair should grow, rest or fall out. When everything works as it should, most of us never notice this extraordinary biological activity happening beneath the surface of our skin. But repeated stress can disrupt that balance.

When everyday habits become biological stress

Traction alopecia develops when hair is subjected to prolonged or repeated pulling. Hairstyles that place excessive tension on the scalp, including very tight braids, cornrows, ponytails, weaves or extensions, can gradually stress the follicle.

Initially, the damage may be subtle. Some people experience tenderness, small bumps or discomfort after styling. Others notice gradual thinning around the temples or hairline. Because these changes develop slowly, they are easy to dismiss. From a biological perspective, however, the follicle is responding to injury.

Repeated tension triggers inflammation, one of the body’s natural repair mechanisms. If the stress is removed early, the follicle often recovers. But when the cycle of injury and repair continues over months or years, inflammation can give way to scarring. Once scar tissue replaces healthy follicular tissue, the stem cells responsible for producing new hair may be permanently lost. At that stage, hair can no longer regrow.

Not all hair loss has the same cause

Hair loss, or alopecia, is not a single condition but a group of disorders with different biological causes. Some forms, such as androgenetic alopecia, better known as male or female pattern hair loss, have a strong genetic basis. Others, including alopecia areata, occur when the immune system mistakenly attacks the hair follicle. Nutritional deficiencies, hormonal changes, infections and certain medications can also affect hair growth.

Traction alopecia is different. Rather than being driven primarily by inherited genes or immune dysfunction, it results from repeated mechanical stress on otherwise healthy follicles, making it one of the few common forms of hair loss that is often preventable when recognised early.

Scientists also suspect that biology may influence why some people are more susceptible than others. While genetics has been linked to several other forms of alopecia, relatively little research has explored whether genetic variation affects an individual’s response to repeated traction in African populations, despite the condition disproportionately affecting women of African descent. Understanding why some follicles recover while others progress to permanent scarring remains an important area for future research.

Pain, in this context, is not simply something to endure, rather your body’s way of asking you to pay attention. A painful hairstyle is often a sign that living tissue beneath the scalp is under mechanical stress. Hair strands themselves cannot feel pain, but the scalp and the follicle certainly can, and dermatologists say recognising these early warning signs and reducing tension before permanent scarring develops is one of the simplest ways to protect long-term hair health.

Dermatologists generally advise avoiding hairstyles that remain painful after styling, alternating hairstyles to reduce repeated stress on the same areas of the scalp, and allowing the scalp time to recover between styles. The earlier tension is reduced, the greater the chance that affected follicles can recover.

Where artificial intelligence fits in

This is where technology may soon play a supporting role. Artificial intelligence is already being explored for applications ranging from skin cancer detection to inflammatory skin diseases, and hair disorders are increasingly attracting similar attention.

In Ghana, a University of Ghana Medical School student has developed TractionScore AI, a free digital tool designed to help African women identify, monitor and reduce their risk of traction alopecia. Rather than diagnosing the condition outright, the tool estimates an individual’s risk based on their hair-care practices, encouraging earlier behavioural changes or medical advice before irreversible damage occurs.

Yet technology alone cannot answer every question. Despite its high burden among women of African descent, the biology of traction alopecia remains surprisingly underexplored in African populations. Scientists are still trying to understand why some hair follicles recover after repeated tension while others progress to permanent scarring, and whether genetics or other biological factors influence an individual’s susceptibility.

Like all medical AI, tools such as TractionScore AI will require rigorous validation across diverse populations before they can become part of routine clinical practice. Even so, they have the potential to encourage earlier awareness, prompt behavioural change and support conversations between individuals and healthcare professionals about a condition that is both common and, in many cases, preventable.

More than a cosmetic concern

Hair has always carried cultural, social and personal significance. Yet beneath every hairstyle lies a living biological system that responds to the choices made over time.

The story of traction alopecia, then, is not really about hair. It is about how living tissue adapts, repairs and sometimes reaches its limit after repeated stress. Understanding that biology allows people to recognise warning signs long before permanent damage occurs.

The emerging role of artificial intelligence is an exciting new chapter in that story. But perhaps the most powerful tool available already lies in a better understanding of the biology beneath our own skin. Long before any algorithm could estimate someone’s risk of traction alopecia, the body had already developed its own warning system. A sore scalp, persistent tenderness and gradual thinning are not simply inconveniences but biological signals that something beneath the surface needs attention. Learning to recognise those signals may be one of the simplest ways to protect the remarkable miniature organs working quietly beneath every strand of hair.