Every day, many people become anxious when they notice a few strands of hair falling out while combing or washing — “Am I starting to lose my hair?” In reality, a normal person loses 50 to 100 strands of hair daily, which is part of the natural renewal cycle of hair follicles. Only when hair loss exceeds this range or when there is a visible reduction in hair density should one be concerned about a hair loss problem.
To distinguish between normal shedding and pathological hair loss, the most commonly used method is the “hair pull test.” Pinch a small tuft of hair (about 50 to 60 strands) between the thumb and index finger, and gently pull from the root toward the tip. If only 1 to 2 strands come out each time, it is considered normal; if more than 6 strands come out at once, it may indicate active hair loss. Note: This test should be performed on the third day after washing your hair, before combing, and the results serve only as a preliminary screening and cannot replace a doctor’s diagnosis.
Another simple indicator is observing the shape of the fallen hair. Normally shed hair often has a small white dot at the root — this is the hair bulb, a normal endpoint in the hair growth cycle. However, if the root of the fallen hair is very thin, or the entire strand is short and fine (especially vellus hairs shorter than 3 cm), it may suggest that androgenetic alopecia is progressing. If hair loss is accompanied by scalp itching, redness, scaling, or broken hairs (hair snapping in the middle rather than falling from the root), other conditions such as fungal infection or alopecia areata should be considered.
Based on evidence-based medicine, losing more than 100 strands per day for more than two consecutive weeks is a recognized warning sign. However, strictly speaking, it is difficult for ordinary people to accurately count every strand of hair they lose. A more practical method is to use a smartphone to take weekly photos of the crown and back of the head under the same lighting and angle, comparing the width of the hair part and the density of the crown area. If the hair part noticeably widens or the visible scalp area on the crown increases within 3 to 6 months, it indicates a reduction in total hair volume and you should see a dermatologist as soon as possible.
Note that telogen effluvium is a common physiological reaction. For example, after childbirth, a serious illness, rapid weight loss, or discontinuation of birth control pills, a large number of hair follicles simultaneously enter the telogen phase, leading to a dramatic increase in hair loss (up to 200 to 400 strands per day). This type of hair loss typically resolves on its own within 3 to 6 months after the triggering factor is removed and does not cause permanent thinning. In contrast, androgenetic alopecia is chronic and progressive: in men, it often manifests as a receding hairline and balding on the crown; in women, it primarily presents as diffuse widening of the hair part.
Another common misconception is that “oily hair means hair loss.” It is true that androgenetic alopecia is often accompanied by overactive sebaceous glands, but oiliness itself is not a direct cause of hair loss. Rather, it is the result of the androgen metabolite DHT (dihydrotestosterone) simultaneously stimulating the sebaceous glands and attacking the hair follicles. Relying solely on oil control cannot prevent genetic hair loss.
In daily life, if you notice significantly more hair on your pillow or in the shower drain, and this persists for more than a month, you can try the “comb counting method”: comb your hair 100 times in the morning, collect the fallen strands, and record the count for three consecutive days to take an average. If the average exceeds 10 strands, or if hair loss during washing exceeds 150 strands (roughly the amount that fills the cap of an ordinary shampoo bottle), it is recommended to seek an in-person consultation.
“Red flag” signals that require special vigilance include: sudden patchy hair loss (alopecia areata, commonly known as “ghost shaving”), red papules or pustules on the scalp, hair loss accompanied by significant weight loss or menstrual irregularities (which may indicate thyroid or hormonal issues). These conditions must be diagnosed by a doctor through trichoscopy, blood tests, and scalp biopsy.
Finally, it is important to emphasize that everyone is born with a different number of hair follicles and varying hair thickness. Some people naturally have fine, soft hair that makes the scalp more visible, but this is not necessarily hair loss. The true benchmark for evaluation is “compared to your own state six months to a year ago,” not a comparison with others’ hair volume.
**For reference only, not medical advice.** If pathological hair loss is suspected, it is recommended to visit a dermatology department at a正规 hospital for an accurate diagnosis through trichoscopy and serological tests (such as ferritin, thyroid function, sex hormones, etc.). Do not use hair growth products or folk remedies arbitrarily.