Hair loss is often caused by stress, hormonal changes, deficiencies, illness, medications, or genetics. It may be temporary or progressive depending on the underlying cause.
Losing hair feels alarming, but separating normal shedding from excessive loss is the first step toward finding the cause. Normal shedding is about 50 to 100 hairs a day, while significantly more can point to telogen effluvium or another condition. Identifying the cause matters because some types regrow on their own, while others need treatment to slow or stop further loss.
Key Takeaways
- Normal hair shedding is 50 to 100 hairs per day, while sudden clumps, widening parts, or visible thinning suggest a problem that needs identifying.
- Temporary causes like stress, illness, and rapid weight loss often resolve with time and recovery, while genetic hair loss needs long-term management.
- Persistent shedding, patchy loss, or scalp inflammation are red flags that need medical attention rather than waiting to see if it improves alone.
How Much Hair Loss Is Normal
Normal hair shedding is about 50 to 100 hairs per day. You might notice this in the shower, on your pillow, or in your brush without seeing visible thinning.
Excessive shedding beyond this range can point to:
- Telogen effluvium
- Hormonal changes
- Nutritional deficiencies
- Or other triggers.
Warning signs suggest something beyond normal shedding. These include hair falling out in clumps, a widening part, or visible thinning at the crown or temples. If it worsens over weeks or months, it may point to an underlying issue.
10 Common Causes Why Your Hair Is Falling Out
Hair loss happens for different reasons, and working out which one applies to you makes finding the right response much easier.
The causes below cover the usual triggers behind hair loss. They range from temporary stress shedding to genetic loss, nutritional gaps, and styling damage.
1. Stress and Telogen Effluvium
Sudden physical or emotional stress can push more hairs into the shedding phase, often a few months after the trigger. Telogen effluvium is a common form of diffuse hair loss triggered by physiological or emotional stress, including childbirth and sudden weight loss.
You might notice sudden shedding triggered by a recent shock to the body, including:
- More hair collecting in the shower or on your brush
- Hair falling out in noticeable clumps
- Increased shedding after illness, childbirth, or surgery
- Thinning following major stress or rapid weight loss
Treatment involves stress reduction, recovery from the trigger, nutrition support, and reassurance that this is often temporary.
2. Hormonal Changes
Pregnancy, childbirth, menopause, and thyroid imbalance can all change the hair cycle and trigger diffuse thinning. Thyroid hormone disorders are a common cause of diffuse hair loss. Checking T3, T4, and TSH is recommended in unexplained cases.
You may notice hormone-related hair changes showing up as:
- Overall thinning across the scalp
- Shedding after pregnancy
- Changes in hair density around menopause
- Hair loss alongside other thyroid-related symptoms
Treatment requires medical evaluation, hormone management, and cause-based treatment rather than guessing with supplements.
3. Genetic Hair Loss
Pattern hair loss is strongly influenced by genetics and usually develops gradually over time.
Large genetic studies show inheritance plays a major role in hair loss. Genome-wide research has identified 71 loci, explaining about 38 percent of the risk for male pattern baldness.
You’ll typically see pattern-based hair loss present as:
- A widening part
- A receding hairline
- Gradual thinning at the crown
Treatment options include minoxidil, finasteride for eligible men, and long term management. Understanding the difference between hair thinning and hair falling out helps identify whether follicle miniaturisation or shedding is the primary concern.
4. Nutritional Deficiencies
Low iron, low vitamin D, low protein intake, and other nutrient gaps can contribute to diffuse shedding and weak hair growth. Research has found lower vitamin D levels in alopecia areata patients, with lower vitamin D tracking with greater disease severity.
You may notice signs that point to nutritional gaps, such as:
- Overall thinning across the scalp
- Brittle or fragile hair
- Low energy levels alongside hair changes
- Hair loss following diet changes or restrictive eating
Treatment involves confirming deficiencies with testing, correcting iron or vitamin shortages, and improving overall diet.
5. Medical Conditions
Autoimmune disease, scalp infections, and trichotillomania can all cause hair loss, sometimes in patchy patterns. Alopecia areata is an autoimmune, non-scarring hair loss disorder caused by immune-mediated damage to hair follicles.
Some signs are more distinctive and may point to specific conditions, such as:
- Patchy hair loss rather than overall thinning
- Scalp irritation or discomfort
- Visible inflammation on the scalp
- Loss of eyebrows or eyelashes
Treatment involves treating the underlying condition and involving a dermatologist when the scalp is inflamed or the pattern is unusual.
6. Medications and Treatments
Hair shedding can sometimes be linked to medications or treatment changes, for example:
- Increased shedding after starting a new medication
- Hair loss following the discontinuation of certain treatments
- Gradual thinning linked to ongoing medication use
- Noticeable changes in hair density over time
Cancer treatments, blood pressure medications, and hormonal treatments are common culprits.
Hair loss that starts after a new medication, cancer treatment, or a medication change points to this cause. Treatment requires reviewing the medication list with a healthcare professional before making changes.
7. Hair Damage and Styling
Tight hairstyles, repeated heat use, and chemical processing can break hair or create traction-related loss. Damage from styling is different from medical hair loss because it affects the hair shaft and follicle through mechanical stress.
These changes often show up in how the hair looks and behaves:
- Breakage rather than shedding from the root
- Thinning or wispy ends
- Uneven hair length
- Hair loss in areas under constant tension
Treatment involves reducing heat and chemical use, switching to gentler styles, and protecting fragile strands.
8. Rapid Weight Loss or Dieting
Fast weight loss and calorie restriction can trigger a shedding response, often through telogen effluvium. The shedding usually appears several weeks or months after the weight loss event rather than during it.
A delayed increase in shedding often points to a recent internal trigger, like:
- Noticeable hair fall several weeks after dieting
- Shedding that begins months after illness
- Increased hair loss following major body changes
- A lag between the event and when shedding becomes visible
Treatment involves slower weight loss, enough protein and micronutrients, and time for recovery.
9. Post-Illness Hair Loss
Hair loss can happen after an illness, infection, fever, surgery, or viral recovery period. A study on mild SARS-CoV-2 infection reported hair loss as an early post-infection symptom. This fits the pattern of post-viral telogen effluvium.
Shedding that starts weeks after the illness rather than during it fits this pattern. Treatment involves supportive care, recovery, and monitoring because this is often temporary.
10. Age-Related Hair Thinning
Hair density can naturally decline with age, especially when combined with genetics or hormonal shifts. Growth slows, individual strands become finer, and overall volume gradually reduces.
Expect slower growth, finer strands, and gradual reduction in density.
Treatment options include:
- Maintenance care
- Medical options when appropriate
- Lifestyle support
Why Hair Is Falling Out Suddenly
Sudden shedding usually links to stress, illness, childbirth, weight loss, thyroid issues or medications. These triggers push hair follicles into the shedding phase at the same time. This leads to noticeable thinning a few months later.
Red flags include patchy loss, scalp pain or inflammation, or thinning that keeps getting worse. Eyebrow or eyelash loss, or shedding that does not slow down, also needs attention.
Research on postpartum women found telogen effluvium often revealed underlying conditions. Around 90.5 percent had another hair loss disorder alongside temporary shedding.
How to Stop or Reduce Hair Loss
Once you have identified what is causing your hair to fall out, the next step is choosing the right response.
The approaches below cover both preventative habits and evidence-based treatments that work for different types of hair loss:
Lifestyle Changes
Focus on protein-rich foods, iron sources like red meat and leafy greens, good sleep, stress control, and gentler hair care. These support recovery from temporary shedding and improve regrowth conditions.
Prevention and recovery matter more than quick fixes. Small, consistent habits tend to deliver better results over time.
Medical Treatments and Procedures
For pattern hair loss, minoxidil and finasteride are evidence-based treatments. They can slow progression and support regrowth in suitable patients.
For inflammatory causes, treatment may involve corticosteroids or immunotherapy.
We offer PRF hair loss treatment for selected cases, especially when hair loss is progressive or long-standing. These procedures are supported by clinical evidence showing improvement in hair density and follicle regeneration.
Conclusion
Many causes of hair loss are temporary, but persistent or patterned loss should be identified early for the best chance of slowing progression. The fastest way to answer why my hair is falling out is to match the pattern, timing, and trigger to the right cause.
Book your hair loss consultation with us today to get personalised advice and treatment options.
FAQs
Why is my hair falling out so much?
Excessive shedding usually comes from stress, hormonal changes, illness, nutritional deficiencies, or medications that push follicles into the shedding phase together.
Can stress cause hair loss?
Yes, stress triggers telogen effluvium, which causes sudden shedding a few months after the stressful event happens.
Will my hair grow back?
Hair often regrows after temporary causes like stress or illness resolve, but genetic hair loss needs ongoing treatment to slow progression.
Is low iron a common cause of hair loss?
Yes, low iron is one of the more common nutritional deficiencies linked to diffuse shedding, especially in women.
When should I see a doctor for hair loss?
See a doctor if shedding persists beyond three months, appears patchy, involves scalp inflammation, or gets progressively worse.
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