Learn what different shades of blood mean and how they signal changes in your health or potential medical issues.

As we age, blood stem cells, the essential source of new blood cells in the body, can accumulate genetic mutations. These ...

People with type O blood enjoy a slightly lower risk of heart disease and blood clotting, but they may be more susceptible to hemorrhaging or bleeding disorders. This may be especially true after ...

insulin signals cells throughout your body to absorb the sugar and use it for energy. Insulin also helps balance your blood glucose levels. When there’s too much glucose in your bloodstream ...

Blood tests can offer a good snapshot of your overall health. They’re also a good way to catch illness or disease early and to see how well your body responds to treatments for various conditions.

REM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.

“You’re dizzy, you’re nauseous, the blood in your body shifts down to your legs when you stand up,” says Scott Kelly, who spent 340 consecutive days aboard the Space Station, a record ...

The abdominal aorta is a large artery in your belly that carries blood ... organs and tissues in the lower part of the body. Its main functions include: Blood distribution: The abdominal aorta is the ...

Scientists develop lab-grown model of the human sensory pathway to investigate how pain signals are transmitted to the brain.

Extreme weather disasters, increasing as the planet warms, can curb blood donations while increasing demand, a new analysis ...

Microplastics and the much smaller nanoplastics enter the human body in various ways, for example through food or the air we breathe. A large proportion is excreted, but a certain amount remains in ...