<s>[INST] My symptoms include...three episodes of extreme lower back pain, left side; onset late in afternoon but each time subsided by next day. Nausea, frequent urge to urinate, but no fever. The three pain episodes have been within the last 7 days. Kidney stones? UTI? Am waiting for my doc to return call. Any thoughts on this come and go situation? The episodes leave me pretty wiped out the following day. [/INST] Hi sir/madam, Thanks for your question on Chat Doctor .the possible causes are:-1. Pelvic inflammatory disease. 2. Rupture or torsion of ovarian cyst.3. Period pains (dysmenorrhoea).4. Degenerative changes in a fibroid.5. Chronic pelvic pain.6. Bowel or bladder problems.7. Irritable bowel syn Chat Doctor. 8. Cystitis.9. Strangulated hernia.10. Muscle and bone problems. Hope I was helpful. Stay healthy, Stay safe. </s>