Hi several medications, including those for blood pressure problems, diabetes, heart disease and cholesterol.Fungal infections (such as tinea capitis) Folliculitisv, Hypervitaminosis A Iron deficiency or malnutrition in general 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... drink excess of water , take biotin supplements ... if severe consult dermatologist... to assess the requirements of hair transplantation...