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Pain brought on by physical activity is likely to be from heart...particularly when associated with throbbing. You should see a cardiologist - EKG / HOLTER (24 to 48 hour ambulatory monitoring) / ECHOcardiogram
/ TMT (Treadmill exercise ECG) / LABORATORY work-up – may all be necessary for further assessment and assistance.
The treating doctor may suggest them depending on need, based on his assessment of the situation.
Wishing speedy recovery