Hair Shedding or Pattern Hair Loss? How to Tell Which One You Have and How It's Treated
Part of: Hair & scalp
How many hairs is it normal to lose a day? How does temporary shedding after childbirth or illness differ from gradual hereditary thinning and from patchy hair loss, and when do you need tests or treatment?
Hair · 4 min read · August 22, 2026
Written and medically reviewed by Dr. Yousef Abo Zarad · German board-certified dermatologist · Last reviewed: September 2026
Key takeaways
- Losing 50 to 100 hairs a day is normal; more than that may be temporary excessive shedding.
- Temporary shedding usually starts months after a stressful event, and hair typically regains its fullness within 6 to 9 months once the cause resolves.
- Hereditary thinning is gradual, is the most common cause of hair loss worldwide, and responds better the earlier treatment starts.
- Sudden bald patches, scaling, or burning and itching deserve a direct dermatologist exam.
- Without an accurate diagnosis, treatment is often ineffective.
How many hairs is it normal to lose a day?
It is normal to shed between 50 and 100 hairs a day. These hairs have finished their growth cycle and are replaced by new ones.
The key distinction is between shedding and hair loss. In shedding, more hairs fall than usual but the follicles are healthy and keep producing hair. In hair loss, growth itself stops because of genetics, the immune system, a medication, damaging hairstyles or hair pulling, and hair only returns once the cause is treated.
How do the three patterns differ?
| Pattern | What it looks like | What it usually means |
|---|---|---|
| Sudden diffuse shedding | Lots of hair on the brush, pillow and shower, with overall thinning but no defined gaps | Temporary shedding after a stressful event (telogen effluvium) |
| Gradual thinning | A wider part, a thinner ponytail, or a hairline receding year by year | Male or female pattern (hereditary) hair loss |
| Patchy loss | A bald patch or strip appearing within 1 or 2 days | Alopecia areata, fungal infection or other causes that need an exam |
Temporary shedding: why does it happen?
The medical name is telogen effluvium. A stressful event pushes many hairs into the resting phase at the same time, so they fall out together months later.
- Childbirth: shedding often peaks about four months after delivery.
- Illness with a high fever, or recovering from an illness.
- Surgery.
- Losing 20 pounds (about 9 kg) or more.
- Severe psychological stress.
Does hair come back after temporary shedding?
Yes, in most cases. Once the cause resolves and the body readjusts, hair usually regains its normal fullness within 6 to 9 months, and it may regrow on its own without treatment.
If the trigger persists, or the shedding has unmasked underlying hereditary thinning, hair will not return to how it was without proper assessment and treatment.
Hereditary thinning: what does it look like?
It is the most common cause of hair loss worldwide. Follicles gradually shrink and produce thinner, shorter hairs. It can begin in the teens but usually starts later.
Because it is slow, it can go unnoticed for months or years.
- In men: a receding front hairline or thinning at the crown.
- In women: a widening part, overall thinning on top of the head, or a thinner ponytail.
Other causes of hair loss
- Alopecia areata: the immune system attacks hair follicles and can affect the scalp, eyebrows, eyelashes and beard.
- Thyroid disease: treating it can reverse the hair loss.
- Low iron, protein, zinc or biotin: hair regrows once the deficiency is corrected.
- Polycystic ovary syndrome and hormonal imbalance, or changing birth control pills.
- Tight hairstyles: can cause traction alopecia, which may become permanent if continued.
- Frequent coloring, perming and relaxing: can damage follicles.
- Some medications: do not stop a medicine on your own; talk to the doctor who prescribed it.
- Scalp fungal infection or scalp psoriasis: hair usually regrows after treatment.
- Chemotherapy: hair usually starts to regrow within months after treatment ends.
How does a dermatologist find the cause?
- History: how long the hair loss has been going on, whether it came on suddenly or gradually, and what preceded it, such as childbirth, illness, dieting or medications.
- Examination: of the scalp, nails and any other area of hair loss, often with dermoscopy.
- Pull test: gently pulling a group of hairs shows how the hair is growing.
- Blood tests or a scalp biopsy: when a disease, deficiency, hormone imbalance or infection is suspected.
There is no single panel of tests for everyone with hair loss. Testing is chosen based on the history and examination.
What are the treatment options?
| Condition | Options | When results appear |
|---|---|---|
| Temporary shedding | Address the trigger; hair often regrows on its own | 6 to 9 months after the cause resolves |
| Hereditary thinning | Topical minoxidil, finasteride for men, spironolactone for some women, PRP, low-level laser, hair transplant | Minoxidil: 6 to 12 months; finasteride: about 4 months |
| Alopecia areata | Corticosteroid injections into patches and other options depending on extent | In one study, most patients regrew at least half their hair within 12 weeks |
| Nutritional deficiency or thyroid disease | Correct the deficiency or treat the thyroid | Hair regrows once the cause is corrected |
What to know about minoxidil
- It can help early hair loss but cannot regrow an entire head of hair.
- It usually takes 6 to 12 months to judge results.
- If you stop, you lose the benefit and gradually notice more shedding, so it is a long-term treatment.
When to see a dermatologist
- A bald patch or strip that appears within 1 or 2 days.
- Hair falling out in clumps when combing, or losing most of the hair on your head.
- Scaling, blisters or sores on the scalp, or burning and intense itching before hair falls out.
- Losing eyebrow, eyelash, beard or body hair.
- Shedding that continues beyond 6 to 9 months after the expected trigger has passed.
- Gradual thinning you want to stop: earlier treatment gives a better chance.
Common questions
- Does washing every day cause hair loss? The hairs that come out when washing would have shed anyway; 50 to 100 hairs a day is normal.
- Do supplements treat hair loss? They help when there is a real deficiency in iron, protein, zinc or biotin; taking them without a deficiency is not known to treat hereditary thinning.
- Is postpartum shedding permanent? Usually not; it peaks around 4 months after birth and hair typically returns within 6 to 9 months.
- Can more than one type happen together? Yes, which is why a dermatologist's assessment matters more than trying random products.
Key numbers
- Spironolactone: effective in about 40% of women with female pattern hair loss.
Medical Evidence
Keep reading on this topic
- For a direct side-by-side comparison, read the difference between telogen effluvium and pattern hair loss.
- For men, minoxidil and finasteride are compared in the male pattern hair loss guide.
- For women, usage and common mistakes are in the guide to minoxidil 5% for women.
- If you are not sure where to start, begin with the hair-loss decision tree.