Yea, you do NOT want to fly after a major medical procedure. In 2004 I had a malignant melanoma on top of my head. Luckily it hadn't metastasized. Was cut out in a minor outpatient procedure. Lab said I was good, no more cancer. This happened a month after my Medical. So I went back to flying not thinking anything about it.
Next medical my AME's nurse said I should call AMAS about how to document the cancer. The Doc there called me back and said I had been flying illegally
Any cancer is grounding until the FAA looks at everything. I had to stop flying even thou I was healthy, get a bunch of paperwork done, and after about 2 months I got cleared to fly and also got a nastygram from the FAA about following regs in the future.
So they do get a tad sensitive about that stuff.