Hello,
Causes of hair fall could be like nutrients and proteins deficiency in the hair cells, emotional or physical stress, hormonal imbalances, dandruff, and serious illness like telogen effluvium, infectious disease and Alopecia areata. If there is underlying disease or nutritional deficiency .Give your diet an overhaul if you're lacking vital nutrients for growth and switch to foods for healthy hair. If it's related to an illness, it can be reversed by effectively treating the underlying cause.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Telogen Effluvium.Iron would help you.