Bambi86, "normal heart rate" is defined as between 60-100 bpm. Tachycardia is most times diagnosed when the heart rate is >100 bpm. If tachycardia is accompanied by palpitations, and the other symptoms you mentioned in your 1st post, it should be investigted by a cardiologist. There are numerous causes. Some are serious and some are not. I have researched this and it seems that cardiologist (or the ones that publish on websites) can't agree on what it is, and what causes it. Most people with heart disease, such as myself, take beta blockers which really control/slowdown the heart rate. So, it is not a problem for us. I would REALLY hate to know, that I had to take beta blockers at age 18, to slow my heart rate. The side effects are too great.
If I were you, I would also have my thyroid checked by an endocrinologist, that
specializes in thyroid disorders/disease. They have more sophisticated testing, and know for sure about the labs they use. Thyroid disease is misdiagnosed a lot, I have read, and have personal experience with. If you fall within the "normal" thyroid test range, find out the exact numbers, and record them for yourself. You may be borderline high or low, within one of the subsets of the test, and the evidence will be hid away in your medical record, with no one to remind you to have it retested.
My advice to you is to make sure that you eat right, and exercise regularly BECAUSE you are going to start down a long road on a life full of medicines and their side effects, that you will regret. Get your life straight. If you are overweight, lose weight. If you have anxiety/mental problems, get them sorted out. If you have any unhealthy lifestyles, get rid of them.
Below is how some doctors view tachycardia. He/She sounds kinda cold to me. You don't have to be a doctor to know that a rapid heart beat, over many years, is bad for you. Good luck
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Question
What is normal for a pulse rate? Female-120 lbs.- 5'2" height-age 56 My pulse is usually over 100 Heart disease runs in my family
Doctors Answer
There is no maximal pulse or heart rate.
Resting heart rate varies significantly from person to person and depends on a number of factors such as level of physical fitness, sex, age, overall health and wellbeing, and medical therapies, if any. Furthermore, heart rate can vary in the same patient depending on the time of day, level of activity or stress, hormonal variations and many other factors. Therefore, no one heart rate is too high or low for any one person.
Factors used to judge whether a given rate is too high or low include presence or absence of symptoms, presence or absence of underlying heart disease or cardiac dysfunction, or simultaneous illnesses, such as a thyroid hormonal disorders.
If the concensus is that a particular heart rate or pulse is too high or low, perhaps consultation with a cardiovascular specialist would be helpful.