How is the hair itchy?

1 When the winter climate is dry, due to the stimulation of peripheral nerves, the small blood vessels in the head contract, which prevents a lot of heat dissipation, and the secretion and excretion of sebaceous glands and sweat glands in the scalp are affected, which stimulates the peripheral nerves in the scalp to itch. Because the weather is dry in winter, the scalp dandruff increases, and when the scalp itches, dandruff will fall one after another, which is also the reason why there are many dandruff and itchy scalp in winter.

2 Signs of seborrheic dermatitis The hair is particularly itchy after washing, which may be a sign of seborrheic dermatitis. Seborrheic dermatitis is caused by mental factors, eating habits, vitamin B deficiency, alcohol addiction and other reasons. When it occurs on the scalp, it begins with mild flushing, covered with gray chaff scales, accompanied by mild itching and rash expansion.

Dandruff is a kind of skin dirt and the result of metabolism. Under normal circumstances, everyone will have slight dandruff, but too much dandruff and clogged pores will cause bacteria to multiply and irritate the scalp.

4 hair is airtight for a long time. Generally speaking, people who like to wear hats and helmets are prone to scalp itching and hair symptoms. Because the hair is airtight for a long time, it is easy to breed fungi, causing a lot of dandruff and itchy scalp. In addition, the pores that are often oppressed by hats and helmets at the hairline are also easy to become loose, causing hair loss.