Thanks for asking at HCM. I have read your question and I understand your concern. Well hair loss could be because of number of reasons like Hereditary, scalp infections, hormonal imbalance or diseases associated with hair loss such as lupus, sarcoidosis and lichen planus. Patchy alopecia the one you are talking about in which there is sudden hair loss leaving smooth bald patches on scalp is due to body s own immune system attacking the hair follicles. The treatment for hair loss include medications like minoxidil and finasteride, laser surgery and wigs or hair pieces. In patchy alopecia hair may grow by itself within a year without any medications. So you can either wait or use the medications prescribed by your doctor. Meanwhile you can prevent your hair loss by Eating a nutritionally balanced diet, avoiding tight hairstyles, such as braids, buns or ponytails and compulsively twisting, rubbing or pulling your hair. Treat your hair gently when washing and brushing, wide-toothed comb may help prevent pulling out hair, avoid harsh treatments such as hot rollers, curling irons, hot oil treatments and permanents thanks Dr Taimoor