The History of Trichology: How Hair Became a Science

The word trichology comes from the Ancient Greek thrix, meaning hair, and the suffix -logia, meaning study ^[1]. Put simply, trichology is the study of hair and scalp. In most places the title of trichologist is treated as a paramedical discipline, distinct from dermatology, the medical specialty that also treats skin, hair and nails ^[1]. The field is young as a named profession, but the questions it asks are ancient. Why does hair fall out? Why does it turn grey? Can it be made to grow back?

This story traces how those questions moved from folk remedies to science. It continues our Journal story From Barber-Surgeons to Trichologists, which follows the people who cared for hair; here we follow the ideas.

Ancient remedies

Some of the oldest medical documents in the world include treatments for hair. The Ebers Papyrus, an ancient Egyptian medical text purchased in 1872 by the Egyptologist Georg Ebers and named after him, is one of the most famous ^[3]. Egyptian medical writing contains recipes intended to treat hair loss and greying, often combining animal fats, plant materials and other ingredients. We should be careful with dramatic modern retellings of individual recipes, which are often exaggerated online. The important point is that hair loss was recognised as a problem worth treating, and that physicians wrote down remedies for it.

Hippocrates and the Hippocratic wreath

Ancient Greek medicine also took an interest in baldness. The common pattern of male hair loss, in which hair thins at the temples and crown while a rim remains at the sides and back, is sometimes called the Hippocratic wreath, after the physician Hippocrates ^[2]. Greek writers observed that baldness was common in men and linked it to age and constitution. Later commentators noted the ancient observation that eunuchs did not go bald, an early clue, though not understood at the time, that hormones play a role.

Barbers, quacks and patent tonics

For most of the following two thousand years, hair care and medicine were loosely connected. Barber-surgeons cut hair and performed minor surgery, while physicians prescribed remedies drawn from ancient authorities ^[6]. In the eighteenth and nineteenth centuries, a booming market for hair tonics, restorers and patent medicines promised to cure baldness. Many were useless, and some were harmful. The gap between genuine knowledge and commercial promise was enormous, and it is one reason a more careful, evidence-minded approach to hair became necessary.

The Institute of Trichologists, 1902

The modern profession of trichology took shape in London at the start of the twentieth century. The Institute of Trichologists was founded in 1902 ^[1]. Its own history records that doctors, scientists and hairdressers founded it as the College of Diseases of the Hair, later the Incorporated Institute of Trichologists. It opened a Scalp and Hair Hospital at 23 Fitzroy Square, London, in 1928 and was formally incorporated in 1925 ^[7]. Its creation marked a turning point: hair and scalp problems were to be studied systematically, and practitioners trained in a defined body of knowledge rather than relying on trade secrets or patent tonics.

Trichology developed as a field that sat between hairdressing and medicine. Trichologists study the structure of the hair shaft, the growth cycle of the follicle and the many conditions that affect the scalp, and they work alongside doctors, referring patients for medical diagnosis and treatment where needed. Over the twentieth century the field spread internationally, and today there are professional associations, research societies and dedicated journals. The first journal for the field, the International Journal of Trichology, was founded in 2009 ^[1].

Hormones and hair loss

A key scientific breakthrough came in the 1940s. Research by the American anatomist James B. Hamilton, published in 1942, showed that male hormones were a prerequisite for common male pattern baldness ^[2]. This explained the ancient observation about eunuchs and placed androgens, especially dihydrotestosterone, at the centre of research into pattern hair loss. Later work built classification systems for the stages of hair loss, including the Hamilton–Norwood scale for men and the Ludwig scale for women, which are still used in diagnosis today ^[1].

The first approved treatments

For most of history, nothing reliably reversed pattern hair loss. That changed in the late twentieth century, partly by accident. Minoxidil was discovered in 1963 and introduced as a treatment for high blood pressure in 1971. Researchers noticed an unexpected side effect, hair growth, and the drug was repurposed. In 1988 topical minoxidil was approved for treating hair loss ^[4].

Finasteride followed. Originally developed for enlarged prostate, it was patented in 1984 and approved for medical use in 1992 ^[5]. As Propecia it was later approved for male pattern hair loss. It works by lowering levels of dihydrotestosterone in the scalp. In the United States, finasteride and minoxidil remain the only two drugs approved by the Food and Drug Administration for male pattern baldness ^[5].

These treatments were landmarks, but they also clarified the limits of what was possible. Both need to be used continuously, and benefits fade when treatment stops ^[4]. They also showed why careful assessment matters: not all hair loss is pattern hair loss, and different causes need different approaches.

Why trichology sits between two worlds

One reason the history of trichology is easy to overlook is that it never fitted neatly into a single category. Hairdressers saw hair as something to cut, colour and style. Physicians saw it, for a long time, as a minor cosmetic concern compared with life-threatening disease. People who were losing their hair, or whose scalps were itchy, flaky or inflamed, often fell between the two, and that gap was filled for centuries by tonic sellers and folk remedies ^[6].

Trichology grew in that gap. Its practitioners took hair seriously as living tissue connected to the rest of the body, affected by nutrition, stress, hormones, illness and the way it is treated day to day. At the same time they stayed close to the practical world of hair care, where many problems first become visible. That in-between position remains one of the field's strengths, and it explains why trichologists today often work in close contact with both hairdressers and doctors.

The modern field

Today the study of hair and scalp covers a wide range of conditions, including alopecia areata, scarring and non-scarring forms of hair loss, telogen effluvium, premature greying and fungal infections of the scalp ^[1]. Tools such as trichoscopy, the magnified examination of the scalp and hair, blood tests for nutritional deficiencies and, where needed, scalp biopsy help distinguish one condition from another ^[1]. Treatments discussed in the modern literature range from medicines to procedures such as microneedling, low-level laser therapy and platelet-rich plasma, with varying levels of evidence ^[1].

Throughout, trichology has kept one foot in the practical world of hair care, advising on shampoos, styling habits and scalp hygiene, and another in the science of the follicle. That balance reflects its history: born between the barber's chair and the physician's surgery, it still connects the two.

Learning more

For readers who want to explore the modern profession, https://trichology.com introduces what trichologists do and how hair and scalp conditions are assessed. For a clinical perspective on advanced hair and scalp care, https://advancedtrichology.com describes contemporary approaches in more detail. Anyone experiencing sudden or patchy hair loss, scalp pain or inflammation should consult a qualified medical professional.

A short timeline

Ancient Egyptian medical papyri record remedies for hair loss. Greek physicians describe the pattern now called the Hippocratic wreath. Barber-surgeons and patent tonic sellers dominate hair care for centuries. In 1902 the Institute of Trichologists is founded in London. In 1942 Hamilton links male hormones to pattern baldness. In 1988 topical minoxidil is approved for hair loss, followed by finasteride for male pattern hair loss in the 1990s. In 2009 the International Journal of Trichology is founded. Each step moved hair a little further from folklore and a little closer to science.