According to the National Heart, Lung, and Blood Institute, a heart tremor, more commonly known as a heart murmur, is when the heart makes an abnormal sound during a physical exam. A murmur is often described by doctors as a whooshing or swishing sound. WebMD reports the majority of murmurs are considered innocent, and an abnormal murmur may be a sign the heart has a damaged valve or other abnormality.
According to the Mayo Clinic, an innocent murmur typically doesn't have any symptoms or require any type of treatment, and it's usually caused by blood flowing too quickly through the heart. Depending on the cause of an innocent murmur, it may eventually go away or last a lifetime. A patient may not notice any symptoms when diagnosed with an abnormal murmur either. The chances of developing a heart murmur increase if there is a family history of heart defects, high blood pressure, or the patient experienced a heart attack in the past. Children born with a hole in the heart, cardiac shunts, or an abnormal heart valve may also experience an abnormal heart murmur at some point. A few signs a person may have a heart condition include shortness of breath, chest pain and dizziness.