General debility caused by severe or prolonged illness like typhoid, syphilis, chronic cold, influenza and anemia also give rise to hair loss, by making the hair weak. Diabetes and thyroid disorders are a major threat. Bacterial, viral or fungal infections can cause spot fall out of hair. It can however be treated with medicated shampoos and lotions. An unclean scalp can cause hair loss because it weakens the hair roots by blocking the pores with the collected dirt.
Hormonal imbalances are an important cause for hair loss.
Pregnancy, contraception with birth control pills and menopause are the common conditions that induce hormonal changes. The kind of hair, whether it is thick, thin, fine, sparse, straight or curly, depends a great deal on the genes inherited. Falling hair is also often inherited and therefore hereditary. It happens for various reasons such as emotional and physical stress of city life, local scalp infection, adverse drug reaction, hormonal imbalances during teenage and pregnancy, etc. The Treatment Adequate amounts of essential nutrients in the daily diet are essential for healthy hair.