How long it takes for a ureteral stone to grow a polyp varies from patient to patient and may range from a few months to six months. The cause of ureteral polyps is not entirely clear and may be related to infection, chronic irritation, developmental defects, carcinogens, and other factors. Stones may lead to the presence of inflammation and chronic irritation of the ureter, which promotes the formation of polyps, due to the different physique of each person, the formation of time has individualized differences, this process may take more than half a year for some patients, some may only need a few months, in addition to ureteral stones are not necessarily will grow polyps. If you have ureteral stones, ureteral polyps, it is recommended to consult a doctor for standardized treatment to avoid delays.