Kidney stones

Also called Renal colic or Nephrolithiasis

Kidney stones are hard deposits that form in the kidneys from waste products in the blood. They can be very small or larger. Small stones often pass out in the pee without being noticed, but a stone that gets stuck can cause severe pain (renal colic) and block the flow of urine.

Last updated Nov 9, 2026

What it is

Not drinking enough water is a common cause. Some diets, medicines and conditions such as gout or hyperparathyroidism increase the risk.

Pain relief and drinking plenty of water help small stones pass. Larger stones can be broken up with shock waves or removed with a telescope or surgery.

Common signs

  • Severe pain in the side or back that comes in waves
  • Pain spreading to the groin
  • Blood in the pee
  • Feeling sick or vomiting
  • Needing to pee often

How it is usually diagnosed

  • Urine tests
  • Blood tests
  • CT scan or ultrasound
  • Stone analysis, if a stone is passed

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • CT and ultrasound reports, with stone sizes
  • Stone analysis results
  • Blood and urine test results
  • Urology letters and procedure notes

Questions to ask your doctor

  • How big is the stone and where is it?
  • Will it pass on its own?
  • What can I change to prevent more stones?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Kidney pain with fever and shivering, or pain so severe that nothing helps: get urgent medical help

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

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