How the Kidney Stone Formed?

Kidney stones form when certain minerals and salts in the urine become too concentrated and crystallize. Over time, these tiny crystals stick together and grow into stones.

How Kidney Stones Form

Step 1: Urine Becomes Concentrated

Normally, urine contains water and dissolved minerals. If you do not drink enough fluids, the urine becomes concentrated, allowing minerals to come into contact and crystallize.

Step 2: Crystals Form

Common minerals that form crystals include:

• Calcium
• Oxalate
• Uric acid
• Phosphate
• Cystine

Step 3: Crystals Grow

Small crystals can enlarge as more minerals attach to them.

Step 4: Stone Develops

The crystals combine into a stone that may remain in the kidney or move into the ureter (the tube connecting the kidney to the bladder).

Step 5: Symptoms Occur

When a stone moves or blocks urine flow, it may cause:

• Severe flank or back pain
• Groin pain
• Blood in urine
• Nausea and vomiting
• Frequent urination
• Burning during urination

Main Causes and Risk Factors

1. Dehydration (Most Common)

Not drinking enough water leads to concentrated urine.

2. High Salt Intake

Excess salt causes the kidneys to excrete more calcium into the urine.

3. Diet High in Oxalates

Foods rich in oxalates include:

• Spinach
• Beetroot
• Rhubarb
• Almonds
• Chocolate
• Tea

4. Excess Animal Protein

Large amounts of:

• Red meat
• Organ meats
• Shellfish

can increase uric acid and stone risk.

5. Obesity and Metabolic Syndrome

These conditions alter urine chemistry and increase stone formation.

6. Medical Conditions

Certain conditions increase risk, including:

• Hyperparathyroidism
• Gout
• Inflammatory Bowel Disease
• Recurrent urinary tract infections

7. Family History

If close relatives have kidney stones, your risk is higher.

Types of Kidney Stones