Low white blood cell after radiotherapy for nasopharyngeal cancer can be improved by dietary adjustment and medication. 1. Dietary conditioning, in the process of radiotherapy for nasopharyngeal cancer, killing cancer cells at the same time can lead to bone marrow inhibition, which is a normal physiological phenomenon. If it is only a mild decrease, eat more fish, chicken and vegetables, etc. to replenish the body with nutrients and then gradually return to normal. 2. Drug treatment, such as white blood cell index decline is serious, you need to use drugs for treatment, such as oral diyu ascending white tablets, etc., can also be injected recombinant human granulocyte colony-stimulating factor and other drugs for treatment. Please strictly follow the doctor’s instructions, do not self-medication.