Suddenly lost a large piece of hair, what is the reason?

Alopecia areata, commonly known as "ghost shaving", is a kind of localized alopecia areata. Its characteristic is that there is no inflammation or abnormality in the place where alopecia occurs, and patients often have no conscious symptoms, which are all discovered unintentionally. The course of the disease is slow, lasting for several months to several years, and most of them can recover on their own, but some patients will have recurrent attacks.

Alopecia areata is usually caused by excessive mental stress, and it is also related to endocrine, immune disorder, infection and other factors. Syndrome differentiation of traditional Chinese medicine is emotional depression, stagnation of liver qi and overwork, which leads to qi stagnation and blood stasis and hair dystrophy.

Alopecia areata is characterized by sudden round or oval hair loss on the head, smooth and shiny scalp, loose hair around and easy to fall off. Individual patients can all take off their hair, which is called total baldness. In severe cases, eyebrows, beards, armpits and pubic hair all fall off, and mane can also fall off, which is called alopecia universalis. The disease can heal itself. In the recovery period, it is found to be slender and soft, yellowish or grayish white, rough and black after a long time, and finally returns to normal. It's caused by hair malnutrition.

Alopecia areata is characterized by sudden round or oval hair loss on the head, smooth and shiny scalp, loose hair around and easy to fall off. Individual patients can all take off their hair, which is called total baldness. In severe cases, eyebrows, beards, armpits and pubic hair all fall off, and mane can also fall off, which is called alopecia universalis. The disease can heal itself. In the recovery period, it is found to be slender and soft, yellowish or grayish white, rough and black after a long time, and finally returns to normal.