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.
Your heart rate is faster when you get excited, anxious, or angry or if you are in pain or have a fever. And it rises temporarily if you smoke or drink a lot of alcohol or coffee. On the other hand, your resting heart rate slows during sleep and tends to be lower if you are very fit. Certain medical conditions, such as thyroid disease, and some medications may affect resting heart rate.