Awareness of your heartbeat is termed as palpitation and it can be due to hyperthyroidism( overactive thyroid), arrhythmias (altered electrical system of the heart), certain medications, heart failure, anemia and low blood sugar. It can be aggravated by
exercise, fever, excessive alcohol consumption, smoking and dehydration. Anxiety, fear or stress can cause palpitations. You should consult your primary care physician for therapy. He will examine you and may ask for blood tests and an EKG.