General causes of low white blood cells are; viral infections, typhoid fever, etc., but also because of medication. White blood cells in the blood are the body's defense against bacterial invasion patrol. When bacteria and other foreign invasions, white blood cells will enter the invaded parts, will be surrounded by bacteria, phagocytosis, elimination, so the white blood cells have the human body "white guardian" name. It can be seen that a decrease in the number of white blood cells will weaken the body's antimicrobial capacity, susceptible to infection. Normal white blood cell count for (4 to 10) × 109 / liter, commonly known as 4000 to 10,000 per cubic millimeter, the average value of 7000. If it is between 4,000 and 7,000, it is low normal and does not require treatment; if it is below 4,000, leukopenia is diagnosed. Even so, it does not necessarily mean that treatment is needed. For example, if the decrease is only mild or transient, does not continue to fall on retesting, and there are no symptoms or discomfort, then there is no need to be nervous and no treatment is needed. Of course, the following cases of white blood cells need to be concerned, and under the guidance of the doctor, to take intervention measures. 1、Severe decrease in white blood cell count requires urgent treatment. White blood cells are made up of granulocytes, lymphocytes, monocytes, and so on. Generally speaking, the most common and most important white blood cell reduction refers to the reduction of granulocytes. If the degree of reduction is too obvious, the bacteria are likely to spread rapidly in the state of complete or basic loss of resistance of the body, and even enter the bloodstream to trigger sepsis, which is a serious threat to life. 2, there are reasons to find the leukopenia should be directed at the cause of treatment. Common causes of leukopenia generally have three categories: one is drugs, such as taking antipyretic and analgesic drugs, sulfonamides, etc., at this time, such as leukopenia is too obvious, should stop taking or change the drug; two is a viral infection, such as influenza, viral infections, etc., at this time, on the one hand, should be actively carried out antiviral treatment, and on the other hand, may be appropriate to take the drug to increase the leukocytes; three is suffering from immune system diseases, such as rheumatoid arthritis, etc., at this time, should be treated according to the cause. Rheumatoid arthritis, etc., the same intervention should be made at this time, taking drugs that can increase white blood cells. 3, at the same time have red blood cells and (or) thrombocytopenia need further diagnosis and treatment. When leukopenia occurs, if the other two cells in the blood, i.e. red blood cells and platelets, have abnormal changes, the problem is more complicated, first of all, we need to further examination, the most commonly done is bone marrow examination, in order to rule out the presence of other blood disorders, and then decide on the treatment plan. [Prevention and Conditioning] 1. Pay attention to diet: avoid cold and unclean diet to avoid digestive system infection. 2. Avoid going to public *** places to prevent respiratory infections. 3. Avoid taking drugs that cause bone marrow damage or leukopenia. 4. Avoid contact with chemical substances and radioactive substances that cause bone marrow damage. (1) Diversified and balanced diet: A balanced diet is the best way to maintain a normal weight. Balanced diet includes coarse grains and mixed grains, rich in calories, moderate protein, rich in fiber, high inorganic salt and rich in vitamins A, C, E, K, folic acid and other easily digested and absorbed food. Such as corn, brown rice, whole wheat flour, vegetable oil, honey, cane sugar, royal jelly, lean meat, eggs, beans, fresh milk, mushrooms, carrots, bamboo shoots, pumpkin, cucumber, cauliflower, spinach, cabbage, celery, cauliflower, tomatoes, garlic, kelp, seaweed, seafood, animal liver, kidney, as well as ginseng, Chinese wolfberries, Chinese yam, ganoderma lucidum, Cordyceps sinensis, and fresh fruit. Low-fat, low-salt, low-sugar diets are desirable, and the intake of fat should be appropriately reduced, such as eating less fatty meat, cheese and cream. (2) Avoid eating raw onion and garlic, pork, pumpkin, alcohol and wine, as well as pungent, warm, fried, greasy, meat and thick flavors, stale, moldy, etc., to help the fire and phlegm and impede the movement of the spleen food. Food such as kelp, seaweed, seaweed, oyster, asparagus, fresh kiwi, etc., which have the function of resolving phlegm, softening and dispersing knots, should be eaten. (3) Products that benefit qi and nourish blood, regulate qi and disperse knots can be given to consolidate the therapeutic effect and facilitate recovery. For example, yam powder, glutinous rice, spinach, loofah, kelp, crucian carp, loach, jujube, orange, hawthorn, rose, etc. (4) If there are digestive reactions and bone marrow suppression phenomenon, you can eat the products that can harmonize the stomach and lower the rebelliousness, benefit the qi and nourish the blood, such as fresh ginger juice, sugarcane juice, fresh fruit juice, Buddha's hand, tomato, raw Job's tear grains, round-grained rice, white lentils, ganoderma lucidum, black fungus, sunflower seeds, and so on.