Hello please do not panic even if the hair fall is severe. Such type of hair fall may happen after a stressful event like fever, surgery or excessive physical or mental stress and many other reasons. Even if the hair falls its root remain in the scalp skin and it will start growing again once effects of stressful event are gone. Please visit a qualified dermatologist to rule out any such thing causing hair fall and take treatment accordingly.
Health Tips
Handle your hair as less as possible. Do not take undue stress which may further increase hair fall. Keep diet healthy and balanced. Get enough sleep.