Kidney Stones: Symptoms, Causes, and Treatment

What is Kidney Stones?

Kidney stones, also known as renal calculi, are hard deposits made of minerals and salts that form inside your kidneys. They can affect any part of your urinary tract — from your kidneys to your bladder. Often, stones form when the urine becomes concentrated, allowing minerals to crystallize and stick together.

Kidney stones can be as small as a grain of sand or as large as a golf ball. Small stones may pass through your urinary tract without causing symptoms, but larger stones can cause severe pain and complications. According to the Mayo Clinic, kidney stones are a common condition, affecting about 1 in 10 people at some point in their lives.

Common Causes

Kidney stones form due to a variety of factors. Here are some of the most common causes:

• Dehydration: Not drinking enough water can lead to concentrated urine, increasing the risk of stone formation.
• Diet: Diets high in protein, sodium (salt), and sugar may increase the risk of some types of kidney stones.
• Obesity: High body mass index (BMI), large waist size, and weight gain have been linked to an increased risk of kidney stones.
• Medical Conditions: Conditions such as hyperparathyroidism, urinary tract infections (UTIs), and inflammatory bowel diseases can increase the risk.
• Family or Personal History: If someone in your family has had kidney stones, you're more likely to develop them. If you've already had one or more kidney stones, you're at increased risk of developing another.
• Certain Medications: Some medications, such as diuretics, calcium-based antacids, and certain HIV medications, can increase the risk of kidney stones.
• Digestive Diseases and Surgery: Gastric bypass surgery, inflammatory bowel disease, or chronic diarrhea can cause changes in the digestive process that affect your absorption of calcium and water, increasing the levels of stone-forming substances in your urine.
• Other Medical Conditions: Diseases such as renal tubular acidosis, cystinuria, hyperoxaluria, and hypercalciuria can also increase the risk of kidney stones.

For more detailed information on causes, you can refer to resources from the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).

Associated Symptoms

Kidney stones may not cause symptoms until they move around within your kidney or pass into your ureter — the tube connecting the kidney and bladder. If a stone becomes lodged in the ureter, it may block the flow of urine, causing the kidney to swell and the ureter to spasm, which can be very painful. At that point, you may experience these signs and symptoms:

• Severe pain in the side and back, below the ribs
• Pain that radiates to the lower abdomen and groin
• Pain that comes in waves and fluctuates in intensity
• Pain on urination
• Pink, red, or brown urine
• Cloudy or foul-smelling urine
• Nausea and vomiting
• Persistent need to urinate
• Urinating more often than usual
• Fever and chills if an infection is present

The pain caused by a kidney stone may change — for instance, shifting to a different location or increasing in intensity — as the stone moves through your urinary tract.

When to See a Doctor

Make an appointment with your doctor if you have any signs and symptoms that worry you. Seek immediate medical attention if you experience:

• Pain so severe that you can't sit still or find a comfortable position
• Pain accompanied by nausea and vomiting
• Pain accompanied by fever and chills
• Blood in your urine
• Difficulty passing urine

These symptoms could indicate a kidney stone that requires prompt treatment to prevent complications such as kidney damage or severe infections.

Diagnosis

If your doctor suspects you have a kidney stone, you may have diagnostic tests and procedures, such as:

• Blood Testing: Blood tests may reveal too much calcium or uric acid in your blood, which can indicate the presence of kidney stones.
• Urine Testing: The 24-hour urine collection test may show that you're excreting too many stone-forming minerals or too few stone-preventing substances.
• Imaging: Imaging tests may show kidney stones in your urinary tract. Options range from simple abdominal X-rays to high-speed or dual-energy computerized tomography (CT) scanning.
• Analysis of Passed Stones: You may be asked to urinate through a strainer to catch stones that you pass. Lab analysis will reveal the makeup of your kidney stones, which can help your doctor determine the cause and provide guidance on preventing future stones.

For more information on diagnostic procedures, you can visit the Centers for Disease Control and Prevention (CDC) or World Health Organization (WHO) websites.

Treatment Options

Treatment for kidney stones varies, depending on the type of stone and the cause. Here are some common treatment options:

Medical Treatments

• Pain Relievers: Passing a small stone can cause some discomfort. To relieve mild pain, your doctor may recommend pain relievers such as ibuprofen or naproxen sodium.
• Alpha Blockers: These medications help relax the muscles in your ureter, helping you pass the kidney stone more quickly and with less pain.
• Lithotripsy: This procedure uses sound waves to break up large stones so they can pass more easily through your urinary tract.
• Percutaneous Nephrolithotomy: This surgical procedure involves removing a kidney stone using small telescopes and instruments inserted through a small incision in your back.
• Ureteroscopy: This procedure involves passing a small scope through your urethra and bladder to your ureter to remove the stone.

Home Treatments

• Drink Water: Drinking as much as 2 to 3 quarts (1.9 to 2.8 liters) a day may help flush out your urinary system. Unless your doctor tells you otherwise, drink enough fluid — mostly water — to produce clear or nearly clear urine.
• Pain Relievers: Over-the-counter pain relievers like ibuprofen can help manage mild pain.
• Medical Expulsion Therapy: Your doctor may give you a medication to help pass your kidney stone. This type of medication, known as an alpha blocker, relaxes the muscles in your ureter, helping you pass the kidney stone more quickly and with less pain.

For more detailed treatment options, refer to guidelines from the Cleveland Clinic.

Prevention Tips

Prevention of kidney stones may include a combination of lifestyle changes and medications. Here are some tips to help reduce your risk:

• Drink Plenty of Water: Drinking enough water is the most important step in preventing kidney stones. Aim to drink at least 2 to 3 liters of water per day.
• Eat Fewer Oxalate-Rich Foods: If you tend to form calcium oxalate stones, your doctor may recommend restricting foods rich in oxalates. These include rhubarb, beets, okra, spinach, Swiss chard, sweet potatoes, nuts, tea, chocolate, and soy products.
• Choose a Diet Low in Salt and Animal Protein: Reduce the amount of salt you eat and choose non-animal protein sources, such as legumes.
• Continue Eating Calcium-Rich Foods: Calcium in food doesn't have an effect on your risk of kidney stones. Continue eating calcium-rich foods unless your doctor advises otherwise.
• Use Medications with Caution: Calcium-based antacids can increase your risk of developing kidney stones. If you take these medications, talk to your doctor about alternative treatments.

For personalized advice on prevention, consult with your healthcare provider or refer to resources from reputable organizations like the National Kidney Foundation.

Emergency Warning Signs

Seek immediate medical attention if you experience any of the following symptoms, as they may indicate a serious complication requiring urgent care:

• Pain so severe that you cannot find a comfortable position
• Pain accompanied by nausea, vomiting, fever, or chills
• Blood in your urine
• Difficulty passing urine or inability to urinate
• Signs of infection, such as fever, chills, or foul-smelling urine

These symptoms can indicate a kidney stone that is causing a blockage or infection, which can lead to serious complications if not treated promptly. Do not ignore these warning signs; seek medical help immediately.

For more information on kidney stones, you can visit reputable sources such as the Mayo Clinic, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), and Centers for Disease Control and Prevention (CDC).