What causes heavy or fast heart beat ?

A fast or rapid heartbeat occurs when the heart beats faster than normal. A normal heart rate is somewhere between 60-100 beats per minute. A heart rate greater than 100 beats per minute is called "tachycardia". People who can feel their heartbeat flutter may be experiencing palpitations. Palpitations can be due to stress, anxiety, medications, ....or it may be a sign of a more serious heart condition. There are many other causes of rapid heartbeat such as:l ung infection (pneumonia), anemia, low blood pressure, drinking alcohol or caffeine, thyroid disorders, and heart disorders including irregular heartbeats (arrythmias). You may consult a specialist for internal medicine for further examinations, information, and possible treatment.