What Causes Hair Loss in Women?
1. Genetic (Hereditary) Hair Loss
Condition: Female pattern hair loss (androgenetic alopecia)
Description: Gradual thinning on the crown and top of the scalp.
Cause: Inherited sensitivity of hair follicles to androgens (male hormones).
Timing: Often starts after menopause, but can occur earlier.
2. Hormonal Changes
Causes include:
- Pregnancy, childbirth, or menopause
- Starting or stopping birth control pills
- Thyroid disorders (hypothyroidism or hyperthyroidism)
Mechanism: Hormonal fluctuations can disrupt the normal hair growth cycle, leading to shedding or thinning.
3. Medical Conditions
Common causes:
- Polycystic ovary syndrome (PCOS), which elevates androgen levels
- Autoimmune diseases such as alopecia areata, where the immune system attacks hair follicles
- Scalp infections, such as fungal infections (ringworm)
- Chronic illnesses or high fevers
4. Nutritional Deficiencies
Hair requires adequate nutrients for growth. Deficiencies may include:
- Iron (especially in menstruating women)
- Zinc
- Vitamin D
- Protein
- B vitamins (especially biotin and B12)
Crash diets or eating disorders can also trigger telogen effluvium (temporary hair shedding).
5. Stress and Psychological Factors
Condition: Telogen effluvium
Cause: Major physical or emotional stress (such as surgery, trauma, illness, or grief).
Effect: More hairs enter the shedding phase, typically 2–3 months after the triggering event.
6. Hair Care and Styling Habits
- Traction alopecia: From tight hairstyles (braids, ponytails, extensions)
- Chemical damage: From frequent coloring, straightening, or perming
- Heat damage: From overuse of straighteners or blow dryers
7. Medications and Treatments
Certain drugs can cause hair loss as a side effect, including:
- Chemotherapy or radiation therapy
- Antidepressants
- Blood thinners
- Beta-blockers
- Retinoids
- Birth control pills (on starting or stopping)
8. Aging
As women age, hair naturally becomes finer and growth slows due to reduced follicle activity and hormonal changes.
