Epinephrine and norepinephrine are closely related substances but there are important differences in their structure, production sites, functions and medical uses.

When loose, watery stools occur frequently, it’s important to investigate the cause. Sometimes this is related to diet, such as a high fiber intake or poor digestion of certain types of foods. However, frequent, loose stools can also be related to infections or chronic, or ongoing illnesses.

Groundbreaking research from Denmark shows that heavy smoking and alcohol consumption can make you look visibly older in four distinct areas of your body.

According to new research from the University of Montreal, Super Mario 64 can help to slow cognitive decline in older adults.

Rashes, growths and skin conditions can often be a clue that something much more severe is going on inside the body. In most cases, you’ll experience a handful of symptoms that indicate it’s time to visit a doctor. Read on to learn what your skin might be trying to tell you.

Facial numbness occurs with many medical conditions including traumatic and nontraumatic nerve damage as well as central nervous system disorders, among others.

Here are the 10 most stressed-out U.S. states (in order of more to most stressed) along with the 10 least stressed-out states (in order of less to least stressed).

Red Hot Chili Peppers bassist Flea opens up about his drug addiction and being prescribed OxyContin just a few years ago following a snowboarding accident.

It’s likely that you may know someone with an alcohol problem. According to the 2015 National Survey on Drug Use and Health, 15.1 million adults in the United States have alcohol use disorder, which is diagnosed when someone’s drinking leads to “distress or harm.” It includes both alcohol abuse and alcohol dependence.

Jennifer Lawrence revealed that she flirted with dieting for the first time for her upcoming film, "Red Sparrow.

White spots on the skin become more noticeable with a tan. This often prompts people to search for the cause. Most white spots are not due to a serious medical condition.

A variety of factors contribute to eye strain, and lighting is one of them. Fluorescent lights, a common form of illumination, may be a factor in eye strain, particularly if the lighting is too bright or too dim.