Why Is My Hair Falling Out? 12 Causes and What to Do
Hair can fall out because of temporary shedding, inherited thinning, a health condition, medication or damage from styling. The right next step depends on the cause. A handful of hair in the shower cannot tell you which one applies.
This guide helps you describe what is changing, understand common explanations and prepare for a medical appointment. It is not a checklist for diagnosing yourself.
First, is it shedding, thinning or breakage?
Shedding means hairs are leaving the scalp. Thinning means density is decreasing, sometimes as strands become finer. Breakage means the hair shaft snaps. These can overlap, and appearance alone does not always distinguish them.
The American Academy of Dermatology (AAD) describes around 50–100 shed hairs a day as normal. Treat this as a general reference, not a daily target you must count. A sustained change from your usual pattern, a widening part or a new bald patch is more useful to discuss with a clinician.
12 reasons your hair may be falling out
1. Inherited pattern hair loss
Male and female pattern hair loss usually develop gradually. You might notice a receding hairline, thinning at the crown or a wider part. Genetics contribute, and treatment can help some people slow progression. Our guide to DHT and hair loss explains the hormone connection and treatment evidence.
2. A recent illness, fever or operation
A physical stressor can shift more follicles into the resting phase, followed by increased shedding later. This is called telogen effluvium. The delay means the trigger may have occurred months before you noticed the hair fall. Some cases settle as the body recovers; persistent shedding deserves assessment.
3. Significant emotional stress
Stress can also be associated with telogen effluvium. But it should not become a catch-all explanation for every hair change. Tell your clinician about stressful events as well as other symptoms and possible triggers.
4. Postpartum hormonal changes
Shedding often increases a few months after childbirth as estrogen levels fall. The AAD’s postpartum guidance says shedding commonly peaks around four months and most women regain normal fullness by their child’s first birthday.
New bald patches, scalp symptoms or hair that has not regained fullness after a year warrant assessment. Postpartum timing does not rule out other conditions. Do not start a hair-loss medicine during pregnancy or breastfeeding without appropriate medical advice.
5. Rapid weight loss or an overly restrictive diet
Major weight loss can trigger shedding. A restrictive diet may also leave you short of protein or other nutrients. Bring a clear account of recent weight changes and eating patterns to your appointment. A supplement is not a substitute for identifying the underlying problem.
6. Iron deficiency or another nutritional problem
Iron deficiency can contribute to hair concerns. Ferritin is one measure used to assess iron stores, but there is no single hair-growth target that should guide everyone’s self-treatment. A systematic review of iron and nonscarring hair loss found lower ferritin on average in affected women, with substantial differences between studies. Association alone does not establish that raising everyone’s ferritin to a fixed number will restore hair.
Testing and supplementation should follow clinical assessment. The AAD advises that supplements such as iron, zinc or biotin should address a demonstrated deficiency. Too much can cause harm.
7. Thyroid disease
Thyroid problems can be associated with diffuse shedding or thinning. Hair changes alone cannot diagnose a thyroid disorder. Mention other symptoms and your medical history so a clinician can decide whether thyroid testing is appropriate. Treating the underlying condition may help, but visible hair recovery takes time.
8. Hormonal changes or an androgen-related condition
Hormonal factors can contribute to thinning. Irregular periods, new acne or increased facial hair alongside scalp thinning are useful details to report. They do not establish a diagnosis of PCOS on their own. A clinician can decide whether further evaluation is needed.
9. Alopecia areata
Alopecia areata is an immune-related condition that often starts with a smooth, round or oval bald patch. It can affect the scalp, beard, eyebrows or other body hair. The AAD’s symptom guide also describes possible nail changes and more widespread loss. Seek assessment rather than assuming a new patch is ordinary stress shedding.
10. Repeated pulling from tight hairstyles
Tight ponytails, braids, extensions or other styles that repeatedly pull on the hair can cause traction alopecia. Risk depends on tension and how the style is worn. Long-lasting traction can cause permanent damage. Loosen or remove a painful style; discomfort is not a requirement for a good installation.
11. Medication or treatment effects
Some medicines and cancer treatments affect hair growth. Timing is important: record when you started or changed a medicine and when shedding began. Do not stop a prescribed medicine on your own. Ask the prescriber whether it could contribute and whether any change is appropriate.
12. Scalp inflammation, infection or hair-shaft damage
Several scalp conditions can cause hair changes. Scaling, sores, pain or redness may help a clinician identify them. Some inflammatory disorders damage follicles and cause scarring, so assessment is important.
Separately, repeated heat, bleach, chemical treatments or rough handling can cause strands to break. DermNet’s overview of hair loss distinguishes hair-shaft damage, shedding, thinning and inflammatory causes. A treatment that helps one may not help another.
When should you see a doctor?
Arrange an appointment if you are worried, if shedding persists or density is decreasing. Seek prompt assessment for new patches, scalp pain, sores, marked scaling or signs of scarring. Tell the clinician if you are losing eyebrows or eyelashes, or have symptoms elsewhere in your body.
You do not need to wait for a supplement or oil to fail first. The NHS recommends speaking with a GP about the cause before approaching a commercial hair clinic. Also mention any effect on your confidence, mood or daily life.
What happens at a hair-loss appointment?
Assessment generally starts with questions about onset, health, family history, medicines and recent changes, followed by examination of your scalp and hair. Blood tests or a biopsy may be appropriate when the findings suggest a particular cause; not everyone needs the same test panel. More than one cause can be present.
Bring a medication and supplement list, relevant recent events and a few photographs showing the change. Ask what diagnosis is most likely, whether tests are needed, what the options are and when to review progress.
What can you do while waiting?
Keep hair care gentle. Use conditioner, detangle without pulling and reduce excessive heat or repeated chemical processing. Choose loose styles that do not pull at the hairline. The AAD’s healthy-hair advice recommends adapting washing and detangling to your hair type, rather than using one routine for everyone.
Maintain a balanced diet and avoid starting several new supplements or treatments together. These steps can reduce additional damage but do not replace treatment for a medical cause.
Frequently asked questions
Why does so much hair come out when I wash it?
Washing can make shed hairs easier to notice, particularly when time has passed between washes. A shower pile alone does not diagnose abnormal loss. Look for persistent changes in shedding, density or scalp symptoms and discuss them if concerned.
Can stress-related shedding grow back?
Many cases of telogen effluvium improve after the trigger settles. The timeline varies, especially if the trigger continues or another condition is present. A clinician can help distinguish temporary shedding from progressive thinning.
Should I take biotin or iron now?
Do not assume you have a deficiency because you are shedding. Discuss testing and supplements with a clinician. High-dose products can cause problems and are not a universal hair-loss treatment.
Does every type of hair loss need minoxidil?
No. The appropriate treatment depends on the cause. A treatment for inherited thinning may not address infection, traction or nutritional deficiency. Read our pattern hair loss guide for a focused explanation of established options and their limitations.
Sources and editorial note
Sources are linked alongside the explanations they support. This article was editorially updated by Care The Hair on 6 October 2026. It provides general education and does not diagnose hair loss or prescribe treatment.
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