What does it mean when the blood count is high?

Elevated blood counts typically refer to white blood cell or neutrophil counts exceeding the normal range in a complete blood count (CBC) test. This condition may be caused by various factors, mainly including: 1. Physiological causes: For example, strenuous exercise, emotional excitement, and weather changes (extreme cold or heat) can all lead to temporary increases in white blood cell count. In these cases, elevated blood counts are usually transient and not severe; once the body's environment returns to normal, blood counts will also recover accordingly. 2. Pathological causes: These include bacterial infections, viral infections, tissue damage after major surgery, drug allergies, transfusion reactions, poisoning (such as pesticide or metal poisoning), hematologic disorders like leukemia, or the presence of tumors in the body. In these cases, elevated blood counts are often accompanied by significant clinical symptoms such as fever, cough, and anemia.