Brief Answer: please see details Detailed Answer: Dear Sir Multiple episodes of involuntary increase in heart rate can be due to rhythm disorder of heart. The best way to look at it is to get an ECG done at the time of episode. Only after deciphering the rhythm at the time of episode further evaluation can be done. If there is a loss of consciousness or attentiveness, chest pain, shortness of breath, vertigo , blackout associated with this increase in heart rate, then it becomes an emergency. You should visit a health care facility to get an ECG done and get evaluated. It may turn out to be benign but definitely needs evaluation at earliest. At times systemic problems like common cold , lung infections, thyroid diseases may be responsible for such episodes (and heart being absolutely normal), however only examination by a your doctor can ascertain that. Hope this helps. Feel free to discuss further. sincerely Sukhvinder

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