### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
My question is: Twice now in the last 6 months, out of no were and for no reason my heart rate went from approx. 50 beats per minute to 150-200 beats per minute. When this happens I dont feel myself and it is scary. Do you know what can be causing this? My age is 41, my height is 5 2 my weight is 150 pounds.

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Brief Answer:There are different causes of high heart rate. You should do further examinations. Detailed Answer:Hello, Thank you for using Chat Doctor. High heart rate episodes, usually aren't serious or harmful, though, and often go away on their own. Most of the time, they're related to stress and anxiety or to consumption of stimulants such as caffeine etc. Even though, heart palpitations may occur in specific medical conditions such as hyperthyroidism, or anemia, low blood pressure, deny Chat Doctor. In rare cases, palpitations can be a sign of a more serious heart condition. A laboratory assessment of the thyroid hormones levels (TSH, fT3, fT4) should be done to exclude a hyperthyroidism. If it will be proven by the results of the above-mentioned levels of the thyroid hormones, you should see an endocrinologist for further treatment strategy and follow-up. Electrolyte levels assessment (Na, K, Cl, Ca) is essential, too and their correction (if deviations are noted) is necessary. Anemia can be ruled out by making a full blood count exam. If anemia is proven, you should treat it and your palpitations will go away. To be very careful, you should make an ECG ate the moment of the high rate episodes, or you should take a Holder ECG which registers your heart rate during the period you keep it. The results should be discussed with the cardiologist. If all the above-mentioned exams are normal, then stress and anxiety remain the most probable causing factor of your symptoms.Meanwhile, you should take plenty of water (2 - 3 liters per day). You should take an equilibrated diet. Try to avoid getting stressed or anxious. Hope this is helpful. Let me know if you need more clarifications. Otherwise, please close and rate the answer. Kind 