A high resting heart rate can be indicative of increased risk for sudden cardiac death, stroke and ischemic heart disease, according to WebMD. While a resting heart rate of 60 to 100 beats per minute is considered a normal range for adults, being at the upper end of the range can mean that serious health problems may lie ahead.
In fact, a study from Norway indicated that for every 10-beat rise in the resting heart rate, there was an 18 percent increase in the risk of death by heart attack in women and a 10 percent increase in men. Similarly, a Japanese study found that resting heart rates of 80 or more were associated with the development of heart disease or obesity in later life.
Tachycardia, which is a condition where resting heart rate is 100 beats per minute or greater, should be evaluated by a doctor. In most instances, tachycardia is caused by abnormal heart rhythm, but it can also be due to smoking, over-consumption of caffeine, thyroid disease, anemia, fever or dehydration. Some people may experience tachycardia with beats of 200 beats per minute or more, which can cause fainting, dizziness, chest pain and shortness of breath, and itmay constitute a medical emergency.