Doctor can evaluate: Persistent heart rate above 100 usually mean something might be wrong. Teens and adults with a bit of dehydration due to minor illnesses, or moderate dehydration due to bad stomach flu, will have higher heart rates while ill. Hyperthyroidism or anemia causes higher heart rates too. Excitement, anxiety, exercise, and heart disease all can raise heart rates. Her doctor can evaluate.
Answered 1/16/2020
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