.Fungal infections (such as tinea capitis),Folliculitis,Hypervitaminosis A,Iron deficiency or malnutrition in general can cause hair fall..
Seborrheic dermatitis, a condition in which an excessive amount of sebum is produced and builds up on the scalp (looking like an adult cradle cap) is also a symptom of hormonal imbalances, as is an excessively oily or dry scalp. Both can cause hair thinning.
Consult dermatologist to rule out cause. Drinking excess of water along with biotin supplements will help..