Metabolic Issues
Certain metabolic conditions would cause the heart rate to slow down. One of the most common ones is hypothyroidism, which occurs when the thyroid gland does not generate sufficient thyroid hormones. This eventually affects the operation of blood vessels and slows your heart rate. Those with hypothyroidism might also suffer from a high diastolic blood pressure, which is the bottom number on the reading of a blood test. It measures the pressure in your arteries in between heartbeats. Metabolic problems are relatively common and would affect anyone, even young and healthy individuals. [6]
