question: Severe lower abdomen and back pain, no fever for a week. 2 spotting in a week no problems with peeing. Ultrasound came out today from a walk in physician and shows the left kidney dmontrated a simple cortical cyst seen in the lower pole measuring up to 1.2 cm. Walk in physician told us to consult to our family doctor and was prescribe with tylenol3. I would like to know how serious because the pain sometimes is so bad. Getting relief by the tylenol3 and hot towel in the lower abdomen