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Can existing heart murmurs in adults worsen?

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Quick Answer

Existing heart murmurs in adults can worsen due to many factors, such as medical conditions, bacteria, infections and age, according to the National Heart, Lung, and Blood Institute. Conditions such as a heart attack or advanced high blood pressure can put additional strain on the heart, worsening an existing murmur.

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Full Answer

Some common germs can be carried to the heart by the blood and cause infective endocarditis, explains the National Heart, Lung, and Blood Institute. This is particularly dangerous for someone who has a heart murmur because the condition is more likely to develop in people with heart valve problems. Calcium buildup, rheumatic fever and hyperthyroidism are all possible causes of heart murmurs or can worsen the condition.

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