5. Irregular Heartbeat
A racing heartbeat is another sign of hyperthyroidism. Even though it’s not exclusive to this condition, it is one of the most common symptoms. Medically, this condition is known as tachycardia. Essentially, it refers to a heart rate that exceeds the normal resting rate. In most cases, that means that if your heart beat is more than 100 beats per minute, you might have tachycardia. Age is an important factor when determining what your normal heart rate is. Another possibility is palpations. Palpitations are periods of irregular heartbeats that can make you feel as if your heart skipped a beat.