Blood is essential to life, but you might be surprised exactly how much the human body contains.

A desire for disability? For people with Body Integrity Identity Disorder, it's an ever-present problem.

COPD and Emphysema are both respiratory conditions, but how exactly are they related? We take a look at what binds these two serious diseases together.

While not usually life-threatening, the stomach flu isn't a fun condition to have. Is there any way that this annoying illness can be prevented or cured?

A total knee replacement involves replacing your entire knee with an artificial joint. Here is a look at how much a knee replacement can cost you.

It is common for tinnitus to occur during a time of high stress or following a period of stress, and research suggests that stress may be influenced by psychological factors.

Night terrors are a parasomnia, or undesirable sleep behavior. Researchers suspect a genetic link may greatly influence the presence of night terrors, although no exact cause has been pinpointed.

Though usually birthmarks are little more than an abnormality, there are some cases where you might want to be concerned. Here’s a look at what your birthmark might mean.