Blue blood may look alien, but it’s one of evolution’s most elegant solutions to life in extreme environments. Here’s how ...

Red blood is the exception, not the rule. Evolution has painted it green, purple and white in animals that push physiology ...

The type of blood clot a person has will typically depend on where they affect a person’s body. Although they have different causes and symptoms, blood clots can have serious or fatal complications.

Blood in your stool may be due to a number of factors, such as straining to poop, anal fissures, and hemorrhoids. Treatment depends on the specific cause of your constipation and bleeding. Many people ...