In-depth

Complications

Mitral valve stenosis

Lifestyle and home remedies

How much sleep do you really need?

The usual advice is eight hours a night, but many factors, such as age and genetics, influence how much shut-eye you need.

Risk factors

Secondhand smoke

It might be someone else's smoke, but the risks are yours. Consider simple steps for avoiding secondhand smoke.

Symptoms

Fatigue

Fatigue can signal many things. Here are some tips to help you decipher why you're wiped out and to regain your energy.

Tests and diagnosis

Apr. 01, 2014

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