Uterine fibroids are non-cancerous growths in the uterus that usually do not cause serious problems. In rare cases, a fibroid can burst or rupture, leading to sudden, sharp abdominal pain and internal bleeding. This may occur if a fibroid outgrows its blood supply, twists on a stalk, or experiences increased pressure, though such ruptures are uncommon. Symptoms can include intense pain, fever, and sudden vaginal bleeding. For further details, Visit the USA Fibroid Centers online.