The symptoms of hair loss may differ depending on the diet. Some of the most commonly observed permanent hair loss symptoms are: Excessive intake of Vitamin A can cause hair loss. Generalized thinning of hair, often starting 3-4 months after the birth of a baby. Likely cause: Hormonal changes. Generalized thinning and dry hair. Likely cause: Under active thyroid gland. Women, who suffer from very heavy periods, may experience losing hair. Excessive...