Medical experts have raised serious concerns about the risks associated with nail biting, revealing that the habit can introduce harmful bacteria into the bloodstream and cause infective endocarditis, a dangerous infection affecting the inner lining and valves of the heart.
According to doctors, bacteria hidden beneath the nails can enter through small skin cuts around the nail bed, travel through the blood, and attach to heart tissue — leading to inflammation and valve damage.
The condition can cause septic blockages and embolisms that spread to the brain or lungs, potentially resulting in strokes or heart failure.
Symptoms of infective endocarditis include fever, chest pain, rapid heartbeat, fatigue, chills, loss of appetite, night sweats, joint and muscle pain, rash, and swelling in the legs or abdomen, along with blood in the urine.
Experts stress that immediate antibiotic treatment — often lasting between four and six weeks — is crucial to eliminate the infection and prevent permanent valve damage.
They strongly advise avoiding nail biting altogether, maintaining proper hand hygiene, and seeking medical help promptly if symptoms such as fever, chest pain, or unexplained fatigue occur.