It causes your marrow to make too many red blood cells so your blood is too thick. You may be more likely to have clots, a stroke, or a heart attack. This disease gets worse slowly, usually over ...

This is a pulmonary embolism, and it’s an emergency. A clot can also lodge in the brain and cause a stroke. Or it can block a blood vessel in the heart and cause a heart attack. These problems ...

DVT happens when a blood clot forms in a deep vein located in the lower leg, thigh, pelvis, or arm, according to WebMD.com. The condition can cause swelling and pain, though sometimes there are no ...