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.
An overactive thyroid can cause palpitations. Low blood sugar levels and anemia can also cause your heart to skip a beat and if you have a fever or are dehydrated you may feel the symptoms. High levels of salt can elevate your blood pressure, which can in turn cause heart palpitations.(Read more about hidden sources of salt in your diet .).n fact, few things are as frightening as your heart missing a beat. It can be very unnerving to feel your heart beating out of the blue and out of time. When your heart skips a beat you may fear you re having a heart attack, or that your fluttering heart is the sign of something serious.