I was told that they could either be polyps or fibroids. I was asked by the doctor if I had planned to have children in the future so that if I chose surgery that they would be careful at removing these growths. Get a 2nd opinion, especially if you haven't had children. Fibroids are common and are not usually resected unless there is a major problem. If they were found incidentally, they probably need no treatment.
Fibroids are benign muscle tumors which occur in the uterine muscles.
Some women are very prone to these and develop quite large growths. Symptoms range from none to excessive pain and bleeding with ones period. Occasionally, they will interfere with pregnancy although this is more controversial. They should not progress to cancer. Endometriosis is quite another problem.