Are uterus fibroids cancerous?

Not necessary.

Fibroids are like tumours that develop in the uterus and are very common but not all fibroids are cancerous. Many types of fibroids are asymptomatic and do not require any treatment.

Though uterine fibroids are common in women, the chances of developing cancer are much lower. The estimated risk of developing cancerous fibroid (leiomyosarcoma) is 1 in 1000.