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WHAT ARE SYMPTOMS AND CAUSES OF KIDNEY STONES

Male urinary system

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Kidney stones (renal lithiasis, nephrolithiasis) are actually hard deposits made of minerals and salts that form inside your kidneys.

Kidney stones have many causative factors and can affect any part of your urinary tract — from your kidneys to your bladder. Often, stones form when the urine gets concentrated, allowing minerals to crystallize and stick together.

Passing kidney stones can be quite painful, but the stones usually cause no permanent damage if they’re noticed in a timely fashion. Depending on your situation, you may need nothing more than to take pain medication and drink lots of water to pass a kidney stone. In other situations — for example, if stones become lodged in the urinary tract, are associated with a urinary infection or cause complications — surgery may be required.

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Your doctor may recommend preventive treatment to lower your risk of recurrent kidney stones if you’re at increased risk of developing them again.

SYMPTOMS

A kidney stone may not cause signs until it moves around within your kidney or passes into your ureter — the tube connecting the kidney and bladder. At that point, you may notice 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
  • Urinating small amounts

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

Make an appointment with your doctor if you notice 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

 

CAUSES

Kidney stones often have no particular, single cause, although several factors may increase your risk.

Kidney stones form when your urine contains more crystal-forming substances — such as calcium, oxalate and uric acid — than the fluid in your urine can dilute. At the same time, your urine may not have substances that prevent crystals from sticking together, creating an ideal environment for kidney stones to form.

Types of kidney stones

Knowing the kinds of kidney stone helps decide the cause and may give clues on how to reduce your risk of getting more kidney stones. If possible, try to save your kidney stone if you pass one so that you can bring it to your doctor for analysis.

Types of kidney stones include:

  • Calcium stones.Most kidney stones are calcium stones, usually in the form of calcium oxalate. Oxalate is a naturally occurring substance found in food and is also made daily by your liver. Some fruits and vegetables, as well as nuts and chocolate, have high oxalate content.

Dietary factors, high doses of vitamin D, intestinal bypass surgery and several metabolic disorders can add to the concentration of calcium or oxalate in urine.

Calcium stones may also happen in the form of calcium phosphate. This type of stone is more common in metabolic conditions, such as renal tubular acidosis. It may also be linked with certain migraine headaches or with taking certain seizure medications, such as topiramate (Topamax).

  • Struvite stones.Struvite stones form in response to an infection, such as a urinary tract infection. These stones can grow quickly and become quite large, sometimes with few signs or little warning.
  • Uric acid stones.Uric acid stones can form in people who don’t drink enough fluids or who lose too much fluid, those who eat a high-protein diet, and those who have gout. Certain genetic factors also may increase your risk of uric acid stones.
  • Cystine stones.These stones form in people with a hereditary disorder that makes the kidneys to excrete too much of certain amino acids (cystinuria).

 

RISK FACTORS

Factors that increase your risk of developing kidney stones include:

  • Family or personal history.If someone in your family has kidney stones, you’re more likely to develop stones, too. And if you’ve already had one or more kidney stones, you’re at increased risk of developing another.
  • Not drinking enough water each day can also add to your risk of kidney stones. People who live in warm climates and those who sweat a lot may be at higher risk than others.

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  • Certain diets.Eating a diet that’s high in protein, sodium (salt) and sugar may increase your risk of some types of kidney stones. This is especially true with a high-sodium diet. Too much salt in your diet increases the amount of calcium your kidneys must filter and significantly increases your risk of kidney stones.
  • Being obese.High body mass index (BMI), large waist size and weight gain have been linked to an increased risk of kidney stones.
  • Digestive diseases and surgery.Gastric bypass surgery, inflammatory bowel disease or chronic diarrhea can create 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 and conditions that may add to your risk of kidney stones include renal tubular acidosis, cystinuria, hyperparathyroidism, certain medications and some urinary tract infections.

 

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