The American Red Cross is urging people to donate blood amid a severe blood shortage. The recent winter storms have contributed to the shortage, causing 500 blood drive cancellations. About 20,000 blood and platelet donations were not collected.

A pregnant woman's blood sample taken in 1972 was mysteriously missing a surface molecule found on all other known red blood cells at the time. More than 50 years later, that strange absence finally led to researchers from the UK and Israel describing a new blood group system in humans.

A trail of what appeared to be droplets of blood was found outside Nancy Guthrie's home, PEOPLE can confirm

Magnesium shows promise in lowering blood pressure for people with hypertension who don't get enough of the mineral. However, there's no ideal time of day to take it.

Each year in the U.S., more than 4.5 million lives are saved by blood transfusions, and about 1 in 5 people admitted to the hospital will need blood.

When it comes to blood pressure, you should always aim for the ideal number - 120 over 80 - not more or less. Dr Levine explains why this matters.

Unfortunately, you’re not able to donate blood today. Not until you’re cancer-free for at least a year. Just on the outside chance that your blood is donated to someone with a compromised immune system. Sorry. It made sense, in a sense.

New Jersey has less than a one-week supply of red blood cells and less than a day's supply of platelets, health officials say.