Hi. Greetings. If the hair fall has been of recent or sudden onset , it's likely due to acute telogen effluvium. This could occur as a result of recent stress in the last six months in the form of a surgery, weight loss, infection, fever, extreme emotional stress or physical. It should settle in a few days to weeks. If not see a qualified dermatologist near you. Warm regards Dr Govind Suresh Mittal.