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The heart contains 4 valves. The valves open and close to keep blood moving in the right direction through the heart. With each squeeze, the valves open and close to keep blood moving forward.

Mitral insufficiency means your mitral valve has problems closing, letting blood leak back through the valve. Mild cases of mitral insufficiency, when a small amount of blood leaks, rarely lead to problems. But severe cases can cause damage to the ventricle and heart muscle.

Potassium supplements help replace potassium your body as lost. This can happen if you take a water pill (diuretic), or because of a medical condition. Read on for tips on how to take potassium, as well as safety advice.

Follow our step-by-step guide to setting up a clean IV worksite.

Blepharitis is a redness and swelling (inflammation) of the eyelids. The membrane covering the inside of your eyelid and the white of your eye may also become inflamed. It can’t always be cured. But it can be controlled.

Information on surgery as a treatment choice for varicose veins.

The most common back problems happen when disks tear, bulge or rupture. This can lead to pain, stiffness, and other symptoms.

The kneecap provides leverage for your muscles as they bend and straighten the leg. It also protects the knee joint.

As the leg moves, the kneecap moves, too. It slides up and down its track on the thighbone. But if the kneecap slides “off track”—even a little—pain and damage can result.