After January's winter weather canceled multiple blood drives, the American Red Cross is urging donors to give this February.

There are several hundred thousand platelets in each drop of blood. Like red and white blood cells, platelets are made in bone marrow.

Anyone who has persistent symptoms of low blood pressure should consult a doctor. Anyone experiencing a sudden, significant drop in blood pressure should receive urgent care.

Hypotension in adults is defined as a blood pressure reading of lower than 90/60. Orthostatic hypotension (also called postural hypotension) is the drop in blood pressure that occurs when you move ...

They are spread between hosts by mosquitoes, spend some time maturing in liver cells, and then eventually end up inside red blood cells. Once there, the parasites proliferate, feasting on hemoglobin.