What Makes Your Muscles Twitch and Spasm?
Sometimes your muscles seem to have a mind of their own. Learn what could be behind your twitches, spasms, and cramps.
Slideshow: Guide to a Brain Aneurysm
Guide to a Brain Aneurysm What Is It? An aneurysm is a weak spot in one of your brain’s arteries (blood vessels that carry oxygen from your heart to the rest of your body). They tend to happen where arteries fork. Over time, flowing blood puts pressure on that spot and makes it give way and balloon out. It’s a lot like a worn-out garden hose that bulges where it’s gotten thin. Most people who have an aneurysm don’t know it. But if it bursts, it can be life-threatening and cause brain damage. Types of Aneurysms There are
Slideshow: Visual Guide to Your Nervous System
Your nervous system controls everything from your heartbeat to your emotions. See where the different parts are and what they do.
Slideshow: Reasons You May Have Brain Fog
Feeling a little “foggy” in the head? Having trouble remembering things? You may have something called “brain fog.” Check out a few things that can cause it.
Slideshow: Tips to Stay Smart, Sharp, and Focused
WebMD shows you how to keep your brain active at every age with these memory tips. Find out how to focus and keep your brain sharp.
Slideshow: Medical Marijuana
See the types of medical marijuana and find out what conditions it can treat.
Slideshow: A Visual Guide to Concussions and Brain Injuries
What happens when you hit your head -- hard? This WebMD slideshow shows you how the brain reacts to and recovers from blows.
Slideshow: The Science Behind Weird Body Quirks
Who hasn't had an ice cream brain freeze, or been awakened by the pain of a charley horse? What's behind these weird body quirks, anyway? Find out by taking this WebMD quiz.