What is the Dull Ache I Feel in my Breast, 8 Years Post-Op?

I recommend that you see your plastic surgeon or doctor to examine you.  It is impossible to diagnose pain over the internet without a physical exam and knowing more about your age, medical history, etc.   There is a list of possibilities such as musculoskeletal pain, the breast capsule tearing or a problem with the implant, or even chest/cardiac pain.   Please see a doctor for evaluation rather than depend on the answers from an online site.

Thank you for the question.

Based on your description,  you may have experienced a muscle strain but if the discomfort persists ( after a period of rest) you should be seen by your plastic surgeon to rule out issues such as encapsulation and/or breast implant displacement.

Best wishes.

From your limited description and without an examination you are describing a "rip" in the scar capsule surrounding the implant. This discomfort can lasts for weeks. Best to see your surgeon or another PS in your area, just to be safe. 

I would probably see your surgeon to make sure everything is OK. It could be something as simple as a muscle strain, but could be something else.

You may have pulled a muscle, but you need to see your surgeon if not resolved by now. It does not seem to be a serious problem and your surgeon can examine you and make sure every thing is OK.