I have to get a mammogram and on the prescription my doctor put diagnostic pain both breast fullness right moer than left should i be worried about this on rx?

No: The doctor is providing a medical rationale for the mammogram for insurance coverage, as routine mammogram at your age would not be covered.

Pain : Pain is a symptom that you experience. If you have no pain, and didn't tell your doctor you have pain, it probably shouldn't be on the request. The "fullness" is a finding on the doctor's physical examination. It is somewhat of a nonspecific term....you should discuss this finding with your doctor. If he/she felt something, you should know the details.

This is for the : insurance company, so they know why the mammogram is being done. Hopefully , your insurance will then pay for the procedure.