Neutropenia is when you have a low number of neutrophils (white blood cells) and may face increased risk of infection. Learn more about managing this condition.
White blood cells
White blood cells are a vital part of your immune system, detecting and dealing with infections. Find out more more about health problems involving white blood cells.
Blood and blood vessels
Blood flowing through the blood vessels carries oxygen, nutrients and waste around the body. Find out the components of blood.