Low white blood cells, what are the results of routine blood tests? Most leukopenia is caused by neutropenia, but also caused by drugs. The general cause of leukopenia: viral infection, typhoid fever, or too much radiation and so on. For treatment, first go to the hospital for a close blood test and other auxiliary tests to see if the white blood cells persist. If you can eat more seaweed, soybeans, jujube, etc., go to the hospital regularly to check the blood routine. I hope it will help you