High white blood cells are a symptom diagnosed through blood tests, which reacts to the occurrence of certain diseases in the body, and the more common ones are as follows: 1) Infection-induced diseases, that is, diseases caused by bacteria and viruses, and the more common ones are pneumonia, meningitis, cholecystitis, as well as measles and encephalitis B. 2) Tissue injuries and necrosis, which are mostly seen after surgeries, and burns and scalds. 3) Allergic reactions, and the more common ones are drug allergies, food allergies, and acute allergic diseases. 4) Tumors, especially leukemia. 5) Poisoning, which is commonly caused by heavy metals, such as lead and mercury. 3, allergic reaction, the more common is drug allergy, food allergy, acute allergic diseases. 4, tumors, especially leukemia. 5, poisoning, common in heavy metals, such as lead, mercury, etc..