The routine blood leukocyte 11.8×10^9/L means that the number of leukocytes per milliliter of blood is 11,800, and if the patient is an infant or young child, this number is within the normal range, and the leukocyte 11.8×10^9/L is not considered high. However, if the patient is an adult, it is mildly high because the normal range of white blood cells in adults is 4,000-10,000/mL, and the white blood cells, 11.8 x 10^9/L, are mildly high. It can also be caused by physiologic conditions, such as after strenuous exercise, after a full meal, after bathing, or when the weather is cold, white blood cells can be mildly elevated. Also, when the body is agitated, the white blood cell count can be mildly elevated due to accelerated blood flow. If there are no such physiological conditions, high white blood cells should be considered inflammation, all kinds of inflammation may cause white blood cell increase, such as acute pneumonia, skin infection, gastritis, appendicitis, etc., may cause white blood cell increase, you need to go to the hospital in time to check to find the cause, and give antibacterial drugs to treat, you can get a good therapeutic effect.