<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing low back pain lately. What could be the cause?  <response>: It could be due to hydatidiform mole, which is a rare pregnancy complication. Have you experienced any abnormal vaginal bleeding or passed grape-like cysts?Note: Hydatidiform mole can also cause vaginal bleeding and grape-like cysts to pass through the vagina 