I had a painful lump in one breast that turned out to be just a cyst. Used to have lumpier breasts before. Also used to have a lot of uterine fibroids and abnormal bleeding which my Gyn believed must have been from a malignancy since they were occurring post menopause in a very low hormone environment. But--no malignancy, just abnormal or unusual symptoms from ME/CFS, as far as I understand. This doctor frightened me though and nearly talked me into a big operation, a hysterectomy, which in itself would have knocked me down for the count. Fortunately I avoided this surgery, but some years later, decided on hip replacement surgery for some painful arthritis and my body has never recovered from the impact of the surgery. Orthostatic intolerance, then neuropathy, got so much worse after that. Medical procedures that healthier people can take in stride can become one way tickets into trouble for those with a chronic illness, especially one not understood by the medical world. Personally I would refuse almost any surgery or aversive drug or other treatment no matter what happens to me medically, based on what I have experienced.