Hirsutism shows up as thick, dark, coarse hair growing in places where women typically don’t have noticeable hair, particularly the face, chest, lower stomach, inner thighs, and back. The hair looks and feels different from the fine, light fuzz that normally covers most of the body. Instead, it resembles the type of hair that grows on your scalp: stiff, pigmented, and rooted deeper in the skin.
Where the Hair Grows
The most recognizable sign of hirsutism is dark hair on the face, especially around the mouth and chin. This can range from a visible shadow on the upper lip to coarse hair along the jawline that resembles a beard. But the face is only one of several areas affected.
Hirsutism follows what’s called a male pattern of hair distribution because the hair follicles in these areas are sensitive to androgens (hormones like testosterone). The full list of areas where this type of hair can appear includes the upper lip, chin, neck, sideburns, chest, upper and lower abdomen, upper and lower back, upper arms, thighs, and buttocks. Not every woman with hirsutism will have hair in all of these locations. Some notice it only on the face and lower stomach, while others see it across the chest, back, and thighs as well.
Terminal Hair vs. Normal Body Hair
The key visual difference is the type of hair itself. Everyone has fine, short, light-colored hair covering most of their body. This is called vellus hair, and it’s nearly invisible. In hirsutism, androgens cause some of those fine hair follicles to produce terminal hair instead. Terminal hair is longer, darker, thicker, and extends deeper into the skin. It’s the same kind of hair that makes up your eyebrows, eyelashes, and the hair on your head.
So when you’re looking at hirsutism, you’re not just seeing “more hair.” You’re seeing a fundamentally different kind of hair in places where only peach fuzz would normally be. A few stray dark hairs on the chin or around the nipples is common and usually not hirsutism. The condition becomes noticeable when the growth is denser, coarser, and spread across androgen-sensitive areas.
How Severity Is Measured
Doctors assess hirsutism using a scoring system that evaluates nine body areas, with each area graded from 0 (no terminal hair) to 4 (extensive terminal hair growth). The scores are added together to produce a total. A score below 8 is generally considered normal, 8 to 15 indicates mild hirsutism, and anything above 15 points to moderate or severe hirsutism. Scores above 25 are classified as severe.
These thresholds vary by ethnicity. For women of Asian descent, a score of just 2 or higher may qualify as hirsutism, while the cutoff is 8 for Black and white women in the U.S. and U.K., and 9 for women of Mediterranean, Hispanic, or Middle Eastern backgrounds. This reflects real biological variation in baseline hair density across populations, and it means what “looks like hirsutism” differs depending on your background.
What Mild vs. Severe Hirsutism Looks Like
Mild hirsutism might look like a persistent shadow or scattered dark hairs on the upper lip and chin, or a thin line of coarse hair running down the lower abdomen. You might notice a few dark hairs around the nipples or on the inner thighs. At this stage, the hair growth is often easy to manage with regular removal and may not be immediately obvious to others.
Moderate to severe hirsutism is more visually striking. The facial hair can become dense enough to require daily shaving. Hair on the chest may cover the area between the breasts or extend across the sternum. The back, shoulders, and abdomen can develop noticeable patches of coarse hair. At this level, the growth pattern closely resembles typical male body hair distribution.
Other Physical Signs That Can Appear Alongside
Because hirsutism is usually driven by elevated androgen levels, it often doesn’t show up alone. When androgen levels are significantly high, you may also notice persistent acne (especially along the jawline and back), thinning hair on the scalp in a pattern similar to male-pattern baldness, and irregular or absent menstrual periods. In more pronounced cases, increased muscle mass, a deepening voice, and changes in body composition can occur. These additional signs together are called virilization, and they suggest a more significant hormonal imbalance.
About 47% of women with even mild hirsutism are eventually diagnosed with polycystic ovary syndrome (PCOS), making it the single most common underlying cause. A small percentage, roughly 2%, have a condition called nonclassic adrenal hyperplasia. Some women have what’s called idiopathic hirsutism, meaning the hair growth occurs without any detectable hormonal abnormality. In these cases, the hair follicles are simply more sensitive to normal levels of androgens, something that tends to run in families, particularly those of Mediterranean, South Asian, or Middle Eastern descent.
Hirsutism vs. Hypertrichosis
Not all excess hair growth is hirsutism. Hypertrichosis is a separate condition where hair increases anywhere on the body, not specifically in the androgen-sensitive areas described above. The hair in hypertrichosis isn’t necessarily coarse or dark; it can be fine and generalized. It also isn’t driven by androgens. Hypertrichosis is typically caused by medications, systemic illness, or rare genetic conditions.
The distinction matters because hirsutism follows a specific, recognizable pattern (face, chest, abdomen, back, thighs) while hypertrichosis is more diffuse and random. If you’re seeing increased hair growth on your forearms, lower legs, or evenly across your body, that’s more likely hypertrichosis. If the growth is concentrated on your chin, upper lip, chest, or lower belly in a pattern that looks typically male, that points toward hirsutism.
How It Typically Develops
Hirsutism most commonly begins around puberty or in early adulthood, when androgen levels naturally rise. It tends to develop gradually over months or years, with hair growth slowly becoming thicker and more widespread. This slow progression is typical of PCOS or idiopathic hirsutism.
Rapid onset is a different story. If coarse hair suddenly appears and grows quickly over weeks or a few months, especially if accompanied by other virilization signs like voice deepening or significant muscle changes, this can indicate a more serious hormonal source such as a tumor affecting the ovaries or adrenal glands. The speed and severity of onset is one of the most important clinical clues in distinguishing between common and rare causes.