Table of Contents
What Is a Kidney Stone?
The kidneys function as a filter system for the body, removing waste such as excess salt, water, potassium, acid, and nitrogen from the blood and producing urine. An accumulation of these substances can lead to crystals in the kidneys, which may combine to form kidney stones. Kidney stones vary in size and shape, ranging from as small as a grain of sand to as large as a golf ball, and can have smooth or jagged edges. If not passed or removed, kidney stones can grow larger. Some kidney stones become too large to pass naturally through urine, requiring surgery to break them into smaller pieces or remove them entirely. It is common to develop multiple kidney stones throughout life, with many individuals experiencing recurrence.
The following are the types of kidney stones:
1. Calcium Stones
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The most common type comprises 4 out of 5 cases in the United States.
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Includes calcium oxalate stones (most common) and calcium phosphate stones.
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Formed from excess calcium not utilized by bones, which the kidneys then excrete.
2. Uric Stones
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It makes up 1 in 10 cases in the United States.
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Results from high uric acid levels, often due to purine, a chemical found in some meats and shellfish.
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Common causes include type 2 diabetes, obesity, metabolic syndrome, and hereditary factors.
3. Struvite Stones
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Struvite stones, also known as "infection stones," account for 5 to 15 percent of all cases in the United States.
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It is formed due to urease, a chemical produced by bacteria causing urinary tract infections (UTIs).
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It is more common in women and individuals with urinary catheters. They can grow large quickly, forming staghorn stones.
4. Cystine Stones
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Cystine stones are caused by the rare inherited condition cystinuria, responsible for 1 in 10 adults and 7 in 10 pediatric kidney stones.
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This results from cystine leaking into urine, which does not dissolve easily, leading to stone formation.
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Most people with cystinuria will form stones throughout their life. The condition can be treated but not cured.
5. Staghorn Stones
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Staghorn stones are characterized by their size and shape rather than chemical makeup.
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It is typically a type of struvite stone but can also be composed of calcium, uric acid, or cystine.
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These stones fill multiple branches of the kidney and can cause damage, requiring prompt removal.
What Is Diarrhea?
Diarrhea is a condition characterized by the frequent passage of loose or watery stools. It can be accompanied by symptoms such as stomach cramps, bloating, nausea, and an urgent need to have a bowel movement. Diarrhea can vary in severity and duration, ranging from a mild, short-term condition to a severe, chronic issue. Infections (viral, bacterial, or parasitic), food intolerances, gastrointestinal disorders, medication reactions, and certain medical conditions are common causes of diarrhea. It often leads to dehydration, especially if severe or prolonged, requiring adequate fluid intake to maintain hydration.
What Causes Kidney Stone?
The following are the causes of kidney stones:
1. Low Urine Volume
Constantly low urine volume is a significant risk factor for kidney stones. It often results from dehydration due to intense exercise, living or working in hot environments, or insufficient fluid intake. Low urine volume leads to concentrated and dark-colored urine, reducing the fluid available to keep salts dissolved. Increasing fluid intake can dilute these salts, potentially reducing the risk of stone formation. Adults prone to kidney stones should aim to produce at least 0.66 gallons of urine daily, requiring approximately 0.79 gallons of daily fluid intake. While water is the optimal choice, sufficient fluid intake is key.
2. Diet
Dietary habits can influence the likelihood of kidney stone formation. High calcium levels in the urine are a common cause of calcium kidney stones, often due to the body's handling of calcium rather than dietary intake. Reducing dietary calcium seldom prevents stones and can harm bone health. Instead, lowering sodium (salt) intake is recommended, as excess dietary salt increases calcium levels in the urine, promoting stone formation. High-oxalate foods can increase the risk of calcium oxalate stones, the most common type. A diet rich in animal protein (beef, fish, chicken, pork) raises acid levels in the body and urine, facilitating the formation of calcium oxalate and uric acid stones. The breakdown of meat into uric acid further increases the risk.
3. Bowel Conditions
Bowel conditions causing diarrhea (for example, Crohn's Disease, ulcerative colitis) or surgeries (for example, gastric bypass) can elevate the risk of calcium oxalate stones by reducing urine volume and increasing oxalate absorption from the intestine. Both factors contribute to stone formation.
4. Obesity
Obesity is a risk factor for kidney stones, as it can alter acid levels in the urine, promoting stone formation.
5. Medical Conditions
Certain medical conditions increase kidney stone risk. Abnormal parathyroid gland growth, which affects calcium metabolism, can elevate calcium levels in the blood and urine, leading to stones. Distal renal tubular acidosis, characterized by acid buildup in the body, also raises the risk of calcium phosphate stones. Rare inherited disorders like cystinuria (excess cystine in urine) and primary hyperoxaluria (excess oxalate production by the liver) can increase the likelihood of specific stone types.
6. Medication
Some medications and supplements, including calcium and vitamin C, may heighten the risk of stone formation. It is essential to inform healthcare providers about all medications and supplements being taken, as these can impact stone risk. Medications should only be discontinued under medical advice.
7. Family History
A family history of kidney stones, such as in a parent or sibling, significantly increases the likelihood of developing a stone.
Can Kidney Stones Cause Diarrhea?
Diarrhea is a common condition characterized by urgent and frequent bowel movements with varying severity and numerous potential causes.
Common causes include:
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Viral infections like norovirus or rotavirus.
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Bacterial infections such as E. coli or Salmonella.
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Parasitic infections like cryptosporidiosis or giardiasis.
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Foodborne illnesses.
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Food allergies and intolerances, such as lactose intolerance.
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Gastrointestinal disorders like Crohn’s disease or irritable bowel syndrome.
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Reactions to medications, such as antibiotics.
Kidney stones do not cause diarrhea. However, surgical removal of large kidney stones through the abdomen may lead to diarrhea. More research is needed to confirm a direct link between kidney stone surgery and diarrhea.
Conclusion
Kidney stones do not cause diarrhea. The consequences of kidney stones are pain in the lower abdomen, an urge to urinate frequently, or sometimes loss of appetite. But these are gastrointestinal problems caused by kidney stones. Kidney stones or diarrhea can both be treated properly with proper medical intervention. The prognosis of the patient with kidney stones is good.
