 [ Symptoms ] how long can the flu live in your home my son has the flu how long until it is safe for my other children and grandchildren to come into my home [ Disease ] since the heart is the pump that supplies oxygen from your lungs and since you are getting out of breath with minor exertion seeing a cardiologist is a good next step you may need an exercise treadmill test with attached to an electrocardiogram oxygen sensor and ultrasound i do not think this important evaluation to rule out a heart related cause would be a waste of money