Lots More Information
Related HowStuffWorks Articles
- How Your Lungs Work
- How Your Heart Works
- How Heart Attacks and Angina Work
- How Congestive Heart Failure Works
- How Diagnosing Heart Disease Works
- How Aspirin Works
- How Blood Works
- How AIDS Works
- How Cells Work
- How does a blood pressure gauge (sphygmomanometer) work? What is blood pressure?
- What is open heart surgery and a bypass operation?
- How do human blood types work?
More Great Links
Learn more about what ails you. Here are some common symptoms.
A comprehensive guide with three thousand articles, including images and multimedia.
