1. Excessive intake of Vitamin A can cause hair loss.
2. Generalized thinning of hair, often starting 3-4 months after the birth of a baby. Likely cause: Hormonal changes.
3. Generalized thinning and dry hair. Likely cause: Under active thyroid gland.
4. Women, who suffer from very heavy periods, may experience losing hair.
5. Excessive shedding of hair, but not complete baldness, associated with various illnesses and drug treatments, rapid weight loss, anemia, stress; a condition known as telogen effluvium.
6. Patches of complete hair loss, in men or women, often with very short hairs visible. Likely cause: Alopecia areata
7. Flaking scalp. Likely cause: Dandruff
8. Hair loss can be caused by burns, x-rays, scalp injuries, and exposure to certain chemicals. In such cases, normal hair growth usually returns once the underlying causes are eliminated.
9. Hair loss may also originate from major shock such as a serious accident, or stress such as prolonged illness, divorce, death of someone close, or liver disease caused by years of heavy drinking.

Conjunction with a high fever, a severe illness, thyroid disorders, iron deficiency, general anesthesia, drug treatments, hormonal imbalance, or extreme stress, following childbirth cause temporary hair loss. In these conditions, a large number of hair follicles suddenly go into a resting phase, causing hair to thin noticeably. Drugs that can cause temporary hair loss include:

1. Chemotherapeutic agents used in cancer treatment
2. Two or more aspirin a day
3. Anticoagulants
4. Amphetamines
5. Retinoids used to treat acne and skin problems
6. Beta-adrenergic blockers used to control blood pressure
7. Diet pills
8. Cortisone – Cortisone can make hair grow on the face and fall out of the head.
9. Oral contraceptives (birth control pills)
10. Some anti-depressants