Our bodies make blood in a specialized niche—a "nursery" within our bone marrow that nurtures blood stem cells so they can replicate and make different kinds of blood cells. The lab of Leonard Zon, MD ...

The amount of blood in your body is generally equivalent to 7% of your body weight. But this is an estimate because it can depend on your sex, where you live, and other factors. Sometimes the amount ...

Why is high blood pressure a big deal? Because it's putting stress on your heart and your arteries, even if you don't feel any different. That added stress can raise your chances of a heart attack or ...

Thin blood means having too few platelets, a part of the blood that helps clots form. Thin blood typically does not cause symptoms but can lead to excessive bleeding and bruising. Blood contains four ...