You must be at least 17 years old to donate to the general blood supply, or 16 years old with parental/guardian consent, if allowed by state law. Learn more about the reasons for a lower age limit.
Other Causes of Elevated Heart Rate. Elevated heart rate when sick is actually your heartâs aid in order to quell the sickness. However, there can be other causes for elevated heart rate as well. Electrical signals produced and sent to the heart tissues are responsible for controlling the heart rate.
Almost everyone has felt their heart beat very fast, felt a fluttering in their chest or thought that their heart was skipping a beat. These can be signs of arrhythmia, or abnormal or irregular heartbeat. Don't panic if you've occasionally had these symptoms. Arrhythmias are extremely common, especially as you get older.