Caused by virus infection, such as influenza.

Genetic factors, congenital immune diseases.

Patients with leukopenia should also choose to eat mutton tripe, goat's milk, silky fowl, sea cucumber, tripe, donkey-hide gelatin, chicken, eggs, pigeon meat, pigeon eggs, white eel, turtle, pseudostellaria heterophylla, yam, Cordyceps sinensis, tremella, bird's nest, Hericium erinaceus, Lycium barbarum, Polygonatum sibiricum, walnut meat, peanut kernel and so on.

(1) A high-protein diet mainly improves the body's resistance and provides a material basis for white blood cells to return to normal.

(2) High vitamin diet, vitamins can promote the growth and development of cells, help the differentiation and proliferation of white blood cells, and promote the return to normal.

(3) Strict disinfection. At this time, patients are prone to infection, so they should be strictly disinfected when making food, and never eat cold or unclean food.

Eggs, lean meat, animal livers, kidneys, milk, beans and their products are suitable for high-protein foods, and yeast-leavened foods, cereals, peanuts, green fresh vegetables, fruits, juices, etc. should be selected for high-vitamin foods to supplement vitamins C,B and folic acid.

Make high-protein foods liquid or semi-liquid, which is easy to digest and absorb. Foods rich in vitamins should not be cooked for too long, so as not to lose vitamins. However, all kinds of foods must be clean, and there must be some sugar, salt and moisture. The daily moisture needs 3000~3500 ml.