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Hair Loss
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Skin Hair Nails

Hair Loss

While losing up to 100 hairs daily is a normal part of the growth cycle, persistent hair loss can be triggered by underlying health conditions, medications, or lifestyle factors.

Overview

It is normal to lose up to 100 hairs from your scalp every day, and in most people, those hairs grow back. However, many men and some women experience hair loss as they age.

Causes

Hair loss can be attributed to a variety of factors, including:

  • Medical conditions: Thyroid problems, diabetes, or lupus.
  • Medical treatments: Certain medicines or chemotherapy for cancer.
  • Lifestyle and genetics: Stress, a low-protein diet, poor nutrition, or a family history of hair loss.

Treatment and Management

Treatment for hair loss depends on the underlying cause. In some cases, addressing the root medical issue will correct the problem. Other available options include medicines and hair restoration.

Frequently Asked Questions

Thyroid dysfunction often causes diffuse thinning, especially on the top and front of the scalp. A simple blood test measuring TSH, free T4, and free T3 can confirm hypo- or hyperthyroidism. If abnormal, treating the thyroid condition usually improves hair growth.
Regular moderate exercise, adequate sleep (7–9 hours), mindfulness practices (yoga, meditation), and balanced nutrition rich in iron, zinc, and biotin can lower cortisol levels and support hair follicle health. Reducing caffeine and alcohol intake may also help.
Minoxidil is generally safe for both men and women and can be started when you notice early thinning or a receding hairline. Finasteride is typically prescribed for men with androgenetic alopecia and requires a prescription; it should be avoided by women of childbearing age due to birth defect risk. A clinician can assess suitability and monitor side effects.
Protein is the building block of hair; aim for 0.8–1.0 g per kilogram of body weight daily. Iron, zinc, vitamin D, and omega‑3 fatty acids support follicle function. Foods like lean meats, beans, leafy greens, nuts, fatty fish, and fortified cereals can help, but if deficiencies are suspected, a blood test and supplementation may be necessary.===
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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