According to the cause of low white blood cells, you should choose the appropriate oral medication to enhance the white blood cells, and at the same time, you should pay attention to dietary supplementation of some high protein, low fat food such as chicken and so on. The causes of low white blood cells include aplastic anemia, typhoid fever, systemic lupus erythematosus and so on. Oral medications include immunosuppressants such as cyclophosphamide and hemostatic drugs such as phenol-sulfonamide. 1. Aplastic anemia: oral drugs include immunosuppressants such as cyclosporine, cyclophosphamide, etc.; pro-hematopoietic drugs such as androgens, hematopoietic growth factors, etc.; antiemetic drugs such as phenolsulfonyl ethylamine, etc. and compound glycyrrhizin and other hepatoprotective drugs. Diet is suitable to eat more food rich in iron, high protein, folic acid, such as spinach, fish, pumpkin, etc. Avoid drinking alcohol. 2. Typhoid fever: once diagnosed, it should be isolated immediately and treated with oral medication such as antibiotics like ciprofloxacin. Dietary advice is to consume high-calorie, high-nutrition, easy-to-digest food such as juice, rice porridge, milk, eggs, etc. Avoid eating badly digested, fiber-rich food, so as not to cause intestinal perforation. 3. Systemic lupus erythematosus: Commonly used drugs include immunosuppressants such as cyclophosphamide; non-steroidal anti-inflammatory drugs such as aspirin; anti-malarial drugs such as chloroquine and glucocorticoid drugs such as dexamethasone. Eat more food rich in calories, protein and vitamins such as fish, chicken, tomatoes, celery, etc. Avoid stimulating and greasy food. Low white blood cells may also be caused by other reasons, such as leukemia, etc. It is recommended to go to the hospital in time, after clarifying the cause of the disease, under the guidance of the doctor to standardize the treatment and dietary adjustments. The above drugs should be used under the guidance of a doctor, avoid self-medication.