Nocturnal is at night, tachycardia is a heart rate over 100 while at rest. There are a number of causes for tachycardia. One of them is anemia, which can happen with blood loss, with insufficient iron in the diet, with a cancer such as multiple myeloma, with kidneys failing, and with chemotherapy. If the tachycardia is sinus tachycardia and not supraventricular tachycardia, you might want to ask the doctor to check for anemia. A racing heart can also happen at night due to anxiety when disturbing thoughts come rushing in in the still of the night. Have you or the one you are asking about seen a doctor about this?
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