Hello,
For the hair fall, causes could be due to stress, fungal infections, alopecia aereata,
hormonal imbalance (overproduction
of dihydrotestosterone and thyroid hormones irregularities),malnutrition, telogen effluvium and sebum plugs on skin.
Sometimes, more hairs enter into the telogen phase at the same time and fall with obvious note by the person. At other times, it may be due hair disorder or some other underlying disease.