Exercise generally increases white blood cell count, but chronic overtraining can cause a WBC drop. Learn more here.

Higher levels of leukocytes -- a form of white blood cell -- are associated with more severe symptoms of long COVID among older women, researchers reported.

These results extend the evidence that low-grade inflammation is not only an outcome of COVID symptom severity but may also precede the acute COVID-19 infection.

A person with leukopenia has a low number of white blood cells, or leukocytes, in their blood. A low white blood cell count may make a person more likely to contract an infection.

A low white blood cell count makes fighting infections harder for your body. A low red blood cell count, called anemia, can leave you feeling low in energy and short of breath.

Sometimes, a high white blood cell count is accompanied by anemia (a low red blood cell count). This happens when bone marrow disease that’s causing overproduction of white blood cells also ...

A low white blood cell count is called leukopenia. A high white blood cell count is usually a sign of inflammation or infection, but it can be due to a blood-related cancer like leukemia or lymphoma.

Introduction Despite multiple studies showing that a normal white blood cell (WBC) count does not exclude serious disease, physicians in all specialties continue to behave as if it did. To assess ...