Scientists at WITS University have found that biting nails greatly increases the risk of heart disease. They also found that your life expectancy may be significantly reduced to the life expectancy of smokers.

Cardiac problems are caused by bacterial endocarditis, an infection of the inner lining of the heart [endocardium] and/or heart valves.
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  Bacterial endocarditis occurs when bacteria enter the bloodstream by finger biting or dental surgery. The bacteria then self-recover the heart valve or other damaged heart tissue
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  This eventually leads to a wide range of heart damage leading to heart failure.

In addition to nail bites, you can contract bacterial endocarditis by other forms of surgery or dental surgery, and tooth whitening is also the culprit. Other medical procedures, such as colonoscopy, cryooscopy, and sigmoidoscopy, increase the risk of bacteria entering the bloodstream.

Flu-like symptoms, fever, chills, and shaking are signs of bacterial endocarditis. You should talk to your doctor right away. Your doctor will then need to perform additional tests, such as blood tests and echocardiography [ultrasound] to determine if you have bacterial endocarditis.

The usual treatment is to stay in hospital for a few days with antibiotics. Antibiotics are usually given intravenously in hospitals, but many people can complete treatment at home. For more complex infections, heart surgery may be required.

Even if bacterial endocarditis is treated, long-term damage can occur. Your heart may be weakened by infection, may not be able to pump properly, or it may be a thrombus or myocardial injury.
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  People who do not seek treatment for bacterial endocarditis may be at risk of death.

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Official – biting your nails leads to heart disease was originally published on Spring