Multiple sclerosis does its damage in a patient's brain, and that's where most drugs are targeted. But one drug holds the dangerous risk of a severe brain infection for some patients.

Changes in cell biology are at the heart of cancer. Specifically, when our genes go off key, the cacophony of cancer blares. Scientists are now learning how these genes are reprogrammed.

Though men who have vascular erectile dysfunction appear to be at a higher risk of developing cardiovascular disease, that doesn't mean ED alone should be considered a risk factor.

Bipolar type I is serious and can be lethal if left untreated. And because of side effects and differences in personal biology, doctors need as many proven medications as possible in order to combat the disease.

Peripheral artery disease patients may not be receiving the same quality of care, and some may be paying more for similar treatment, depending on the type of provider.

Obesity is a known risk factor for colorectal cancer. What has not been known, until now, is if and how the timing of the extra weight impacts life after diagnosis.

Sometimes seeing the forest requires first seeing the trees - and the leaves on those trees. A new way to "see" regular changes in eye cells might lead to detecting retina problems as well.

The most dangerous threat to your hearing health might very well be in your pocket or purse right now: your MP3 player.