Do kidney stones cause flank pain?

A stone can irritate or partly block the tube between the kidney and bladder. This may cause pain in the side or back below the ribs, sometimes spreading toward the lower abdomen or groin. Pain may come in waves as the ureter tightens around the stone. Nausea, vomiting, sweating, or blood in the urine can occur as well. Flank pain has other possible causes, so its location and pattern do not confirm kidney stones on their own.

Rest in a position that feels comfortable and take fluids in small amounts if you can keep them down. Do not force large volumes of water during a severe pain episode. A clinician or pharmacist can advise on suitable pain relief, taking account of pregnancy, kidney disease, stomach ulcers, allergies, and other medicines. Arrange medical assessment if the pain is new, persistent, or difficult to control; examination and urine testing may help identify the cause.

Seek urgent care for flank pain with fever or chills, repeated vomiting, faintness, confusion, very little urine, or feeling markedly unwell. A blocked urinary tract with infection can become serious. Get prompt assessment for severe pain that does not settle, visible blood in the urine, or pain during pregnancy. Emergency help is appropriate if weakness, collapse, or confusion develops.

Ask whether the pain pattern fits a urinary stone, whether urine or imaging tests are needed, which pain medicines are safe for you, and what symptoms should prompt immediate review.