For people with very rare types, obtaining lifesaving blood can involve a complex network of donors and doctors that stretches across the globe.

“She is undoubtedly the only known case in the world,” said Thierry Peyrard, a medical biologist at Établissement français du ...

A lack of vitamin D, even in generally healthy people, is linked with stiffer arteries and an inability of blood vessels to relax, researchers have found.

A 68-year-old woman from Guadeloupe has been identified as the sole person on Earth known to have a newly discovered blood type—one so rare that she is only compatible with herself. Scientists ...

Waking up to a bloody writing on your bedroom wall may constitute nightmare material for most, but one Redditor found a 'more ...

Getting those fluids back to Earth was logistically challenging even when rockets didn’t blow up, according to Lindsay Rizzardi, a senior scientist at the HudsonAlpha Institute and an author on ...

Researchers have found that people with lower blood levels of vitamin D were twice as likely to die prematurely as people with higher blood levels of vitamin D. The finding was based on a ...

Watch Earth's Shadow Create a "Blood Moon" Total Lunar Eclipse Early birds and sky-watchers caught the start of a total lunar eclipse on the National Mall in Washington D.C.

An unidentified astronaut aboard the International Space Station had a deep vein thrombosis — or blood clot — in the jugular vein of their neck, according to a new case study.

A total lunar eclipse or blood moon will happen overnight on July 27. The eclipse will be colored orange-red due to sunlight passing through Earth's atmosphere and bouncing off the moon. The event ...

This month, Mars will be at its brightest since 2003, and some skywatchers will be treated to a lengthy lunar eclipse.

The woman was preparing for surgery in a Paris hospital when doctors noticed something strange. Her blood didn’t match any known type. It wasn’t A, B, AB, or O. Nor did it fit any of the ...