<human>: Im having some issues with my heart rate.  It will sometimes get as high as 130 beats per minute while I am just standing still.  I used to be very active, but now every time I run my pulse goes up to 180 and it makes it hard to breathe.  I am also experiencing black out spells and getting very dizzy.
<bot>: Hello! Welcome and thank you for asking on Chat Doctor! I understand your concern and would explain that your symptoms could be related to POTS (postural tachycardia) or cardiac arrhythmia. For this reason, I would recommend consulting with a cardiologist for a careful physical exam and some tests: - a resting ECG and cardiac ultrasound and a resting ECG- an ambulatory 24-48 hours ECG monitoring to examine your heart rhythm for a prolonged time and exclude cardiac arrhythmia-thyroid hormone levels for thyroid gland dysfunction - complete blood count for anemia-blood electrolytes for any possible imbalance. - a Head Up Tilt test may be needed to investigate for possible orthostatic intolerance, including POTS. You should discuss with your doctor on the above tests. Hope you will find this answer helpful! Wishing good health, 