Hair loss: what is normal and when to act
Losing between fifty and a hundred hairs a day falls within normal limits, and it is only when the loss continues beyond three months, density visibly reduces or the hairline recedes that a medical assessment is warranted.
gelisted editorial team · Updated 15 August 2026
The short version
- Normal daily loss runs 50 to 100 hairs.
- The growth phase of a follicle lasts 2 to 6 years.
- Shedding after a stressful event appears 2 to 3 months later.
- Any treatment needs 4 to 6 months before it can be judged.
Hair on the pillow alarms more than it informs. The figure that matters is not how much falls but whether what grows behind it is as thick.
How the cycle works
Each follicle alternates a growth phase of 2 to 6 years, a transition phase of 2 or 3 weeks and a resting phase of about 3 months, after which the hair falls and a new one starts. On a head with roughly 100,000 follicles, between 5 and 15 per cent sit in the resting phase at any moment, which is what produces the normal daily loss of 50 to 100 hairs.
| Situation | Onset | Usual course |
|---|---|---|
| Normal daily loss | constant | 50 to 100 hairs |
| Shedding after stress or fever | 2 to 3 months later | recovers in 6 to 9 months |
| Shedding after childbirth | 2 to 4 months later | recovers in 6 to 12 months |
| Seasonal shedding | autumn and spring | weeks |
| Pattern hair loss | progressive | needs sustained treatment |
| Loss from iron deficiency | variable | improves when corrected |
| Time to judge a treatment | 4 to 6 months |
When to seek assessment
When the loss continues beyond 3 months. When scalp becomes visible where it was not. When the hairline recedes or the crown thins. When patches appear with defined edges. And when it comes with itching, heavy scaling or pain, which point to a scalp condition needing a diagnosis before any product is applied.
What gets tested
Blood work covering iron and ferritin, thyroid function and vitamin D, because deficiencies are a frequent and correctable cause. A history of the last 6 months looking for fever, surgery, restrictive dieting or a change of medication. And examination of the scalp with dermoscopy, which distinguishes a diffuse shedding from a progressive miniaturisation pattern.
The pattern matters more than the quantity: diffuse loss across the whole head has a very different outlook from thinning concentrated at the crown and temples.
What a salon can do
Help without promising what is not theirs to promise. Avoid styles with sustained tension, which cause traction loss along the front hairline. Space out aggressive chemical processes. Recommend gentle products. And not stand in the place of a diagnosis. A change of cut or colour technique can improve perceived density considerably while a prescribed treatment takes its 4 to 6 months to work.
Frequently asked
+How much hair is normal to lose daily?
Between 50 and 100 hairs, within the natural cycle of growth and rest of the follicle.
+When should I be concerned?
If loss continues beyond three months, scalp becomes visible or the hairline recedes.
+Why does hair fall after an illness?
It is a shedding phase appearing two or three months after the event, usually recovering in 6 to 9 months.
+What tests are done?
Blood work for iron, ferritin, thyroid and vitamin D, plus scalp examination with dermoscopy.
+How long before a treatment shows?
Not before four to six months, because of the pace of the hair cycle itself.
Sources
- 1Ministerio de Sanidad, Gobierno de España (August 2026)
- 2Instituto Nacional de Estadística, INE (August 2026)