Excitement can cause premature heartbeats. Premature heartbeats are called preterm contractions and usually have certain triggering factors, such as when patients are emotionally excited or stressed, nervous, anxious or overly tired. In addition, patients can also experience premature heart beats if they drink a lot of alcohol, smoke, drink coffee, or drink strong tea. Premature heartbeats can also occur if the patient takes certain medications, such as those used to treat asthma. For organic heart disease, such as coronary artery disease, myocarditis, pericarditis, hypertensive heart disease, hypertrophic obstructive cardiomyopathy, these conditions can also lead to premature heartbeat, as well as ionic disorders that can cause premature heartbeat.