Kidney Sand: Symptoms and What It Means

The diagnosis of "kidney sand" is often made based on ultrasound results or a urine test. It refers to small salt crystals that can eventually grow into stones; small crystals often cause no symptoms. Below is what this means, what symptoms occur, and at what point a doctor is needed.

What kidney sand is

Urolithiasis, or kidney stone disease, is a condition in which concrements form in the organs of the urinary system. It can manifest in different ways: as fine-grained, powdery urinary sand, as coarse-grained particles, and as stones reaching a considerable size. Nephrolithiasis refers to concrements specifically in the kidneys.

Urolithiasis occurs at any age, most often between 20 and 50 years. The lifetime risk of developing it reaches 10%. In hospital urology departments, 30–40% of admissions are due to kidney stone disease.

When kidney sand requires seeing a doctor

You should see a doctor if symptoms appear: pain in the side or lower back, blood in the urine, fever and chills, vomiting, cloudy urine, burning during urination. Delaying is dangerous: if help is delayed, urinary tract infection and kidney damage are possible.

With a long course of urolithiasis, pyelitis and pyelonephritis may develop. Stones tend to recur, especially if the cause has not been found.

The presence of sand by itself is not a reason to call an ambulance; 103/112 — if severe pain in the side or lower back does not go away, a high fever with chills has developed, or repeated vomiting has appeared.

Sand, microliths, and stones: what the difference is

By size, concrements are divided into groups: up to 5 mm, from 5 mm to 2 cm, and more than 2 cm.

The chemical composition can vary: oxalate, urate, cystine, and struvite (infectious) stones. The most common are calcium stones; they occur more often in men aged 20–30.

Why salts and crystals form in the kidneys

Crystals appear when the urine contains too much of the substances from which they are built; they can grow into a stone over weeks and months. Three mechanisms are called key: sharply acidic urine (pH below 5.5), low diuresis due to insufficient fluid, and elevated uric acid levels. The strongest risk factor is low water intake: stones are more likely in someone who excretes less than 1 liter of urine per day.

Other factors: heredity, metabolic disorders (gout, diabetes mellitus, hyperparathyroidism), structural features of the urinary tract, urinary tract infections, a high-protein diet with little fiber, physical inactivity, and the use of certain medications.

Symptoms of kidney sand in women and men

Small crystals are often not felt at all: they pass in the urine, and the person does not notice it. Symptoms appear when a particle moves along the ureter and obstructs the outflow of urine.

• Severe pain in the side, lower back, or lower abdomen that starts and stops suddenly.
• Pain radiating to the groin, in men — to the testicles, in women — to the labia.
• Nausea and vomiting.
• Blood in the urine, a change in its color, cloudy urine.
• Frequent urge to urinate, elevated temperature, chills.

The set of symptoms is the same in women and men; only the area to which the pain radiates differs. You can speak directly to the doctor about the color of urine and pain.

How sand is detected: urine test and ultrasound

The diagnosis is often made based on complaints, but it is confirmed by examinations. A urine test shows crystals and red blood cells. Blood is checked for calcium, phosphorus, uric acid, electrolytes, and kidney function.

Kidney ultrasound is a common method: it shows stones, the degree of dilation of the calyceal-pelvic system, and the condition of the other kidney. In adults with severe pain, a non-contrast computed tomography may be performed; in pregnant women and children under 16, ultrasound is more often chosen.

The material is for reference: it does not replace a doctor's consultation.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer