Your kidneys and ureters work like a plumbing system to filter your blood and remove waste.
Let’s look at the science to see why it hurts.
Kidneys filter
Your two kidneys act as filters for your blood, turning waste into urine. This urine then travels down two narrow tubes called ureters to reach the bladder.
Kidney stones and obstruction
Sometimes, minerals in the urine crystallise and form hard stones. If a stone stays in the kidney, it usually doesn’t hurt. The pain begins when a stone falls out of the kidney and gets stuck in the narrow ureter pipe.
Start of pain
The stone acts like a plug in a drain. Because the urine cannot pass through, it backs up in the kidney, causing the kidney to swell and stretch. This stretching of the kidney is the source of the initial deep ache.
The intense squeeze
To clear the blockage, the muscles in the ureter wall begin to squeeze violently. It is trying to push the stone down into the bladder. Since the ureter is a very thin, sensitive muscle, these spasms cause sharp, stabbing pain.
The wave effect
The pain often comes in waves. When the gallbladder tries to squeeze, the pain peaks. When it tires out and relaxes, the pain may dull down, only to return the next time it tries to push against the blockage.
What are the signs of (Renal Colic)?
Renal colic has a very distinct shifting pattern as the stone moves through the Renal tract.
The Flank Pain
The pain usually starts suddenly in your flank—the area on your back just below your ribs. It is often described as one of the most intense pains a person can experience.
The Downward Shift
As the stone moves lower in the tube, the pain travels downwards. It moves from your back, around your side, and down into your lower belly or groin area.
Changes in Urine
Because the stone is irritating the lining of the pipes, you might notice:
- A constant, urgent need to go to the bathroom.
- Pain or burning while urinating.
- Urine that looks cloudy, pink, or reddish (due to tiny drops of blood).
Nausea
The nerves for the kidneys and the stomach are closely linked. Intense Renal pain almost always triggers nausea or vomiting.
Renal Colic is unpredictable
The pain can strike without warning, often waking you up from a deep sleep or hitting while you are driving or at work.
Renal Colic is exhausting
The waves of pain are so intense that they leave the body in a state of shock. Even after the pain subsides, you may feel physically and mentally drained for days.
Renal Colic creates some anxiety
Once you’ve had one stone, the fear of another attack can make you over-analyse every minor backache or change in your body.
#KnowYourPain
How to find relief
Relief is about relaxing the Renal bladder, Renal tract and helping the stone pass through the system.
Medical Management
Doctors often prescribe Alpha-blockers. These are medicines that specifically tell the muscles of the ureter pipe to relax, making it wider and easier for the stone to slide out.
Hydration
Drinking massive amounts of water is the most important fix. High water pressure helps push the stone down the tube and prevents new crystals from sticking together.
Pain Control
Gynaecologists or GPs may prescribe specific anti-inflammatory painkillers. These don't just dull the pain; they reduce the swelling in the ureter, which gives the stone more room to move.
Renal Colic: The Indian Context
Kidney stones are a massive health challenge in India, with environmental and dietary factors making certain regions much more vulnerable.
The Stone Belt of India
A massive region covering Rajasthan, Gujarat, Punjab, Haryana, and Maharashtra is known as India’s Stone Belt. In these states, the risk can be up to 7.5% higher than in South India due to the hot, dry climate and hard mineral-rich water.
The Gender Gap
Men are significantly more likely to suffer from kidney stones than women. Research across India shows a male-to-female ratio of roughly 3:1
The Working Age Population
Kidney stones are most common in people who are in their most active years. Nearly 60% of cases in India are diagnosed in adults between 20 and 40 years old. Dehydration during long working hours and diets high in salt and animal protein are major triggers for this age group.
When to Consult a Healthcare Professional
Renal colic can become a medical emergency if the backup causes an infection. Seek help immediately if:
- You have a fever or chills alongside the pain.
- You are unable to pass any urine at all.
- The pain is so severe that you cannot sit still or find a comfortable position.
- You have persistent vomiting and cannot keep fluids down.