Polycythemia is an increase of red blood cells in the body. The extra cells cause the blood to be thicker, and this, in turn, increases the risk of other health issues, such as blood clots.

Polycythemia vera (PV) is a blood cancer that begins in the marrow of your bones, the soft center where new blood cells grow. It causes your marrow to make too many red blood cells so your blood is ...

While taking testosterone-based HRT, your doctor will monitor your bloodwork for signs of polycythemia. If found, several treatment options are available. Testosterone is responsible for many body ...

When a newborn has polycythemia, it means they have too many red blood cells. A doctor typically diagnoses polycythemia using a hematocrit test. Polycythemia can lead to thickening of the blood and ...