Very small kidney stones are unlikely to cause many symptoms. It may even go undetected and pass out painlessly when you urinate.
Symptoms usually occur if the kidney stone:
- gets stuck in your kidney
- starts to travel down the ureter (the tube that attaches each kidney to the bladder) – the ureter is narrow and kidney stones can cause pain as they try to pass through
- causes an infection
In these cases, the symptoms of kidney stones can include:
- a persistent ache in the lower back, which is sometimes also felt in the groin – men may have pain in their testicles and scrotum
- periods of intense pain in the back or side of your abdomen, or occasionally in your groin, which may last for minutes or hours
- feeling restless and unable to lie still
- nausea (feeling sick)
- needing to urinate more often than normal
- pain when you urinate (dysuria)
- blood in your urine (haematuria)– this may be caused by the stone scratching the kidney or ureter
- Blocked ureter and kidney infection
The symptoms of kidney stones
A kidney stone that blocks the ureter can lead to a kidney infection. This is because waste products are unable to pass the blockage, which may cause a build-up of bacteria.