Kidney Stones (cont.)
Kidney Stones Causes
There is no consensus as to why kidney stones form.
- Heredity: Some people are more susceptible to forming kidney stones, and heredity may
play a role. The majority of kidney stones are made of calcium, and
hypercalciuria (high levels of calcium in the urine) is a risk factor. The
predisposition to high levels of calcium in the urine may be passed on from
generation to generation. Some rare hereditary diseases also predispose some
people to form kidney stones. Examples include people with renal tubular
people with problems metabolizing a variety of chemicals including cystine (an amino
acid), oxalate, (a type of salt), and uric acid (as in
- Geographical location: There may be a geographic predisposition, and where a person lives may predispose them to form kidney stones. There are regional "stone belts," with people living in the southern United States having an increased risk of stone formation. The hot climate in this region combined with poor fluid intake may cause people to be relatively dehydrated, with their urine becoming more concentrated and allowing chemicals to come in closer contact to form the nidus, or beginning, of a stone.
- Diet: Diet may or may not be an issue. If a person is susceptible to forming stones, then foods high in calcium may increase the risk; however, if a person isn't susceptible to forming stones, diet
probably will not change that risk.
- Medications: People taking diuretics (or "water pills") and those who consume excess calcium-containing antacids can increase the amount of calcium in their urine and potentially increase their risk of forming stones. Taking excess amounts of vitamins A and D are also associated with higher levels of calcium in the urine. Patients with HIV who take the medication indinavir (Crixivan)
may form indinavir stones. Other commonly prescribed medications associated with stone formation include dilantin and antibiotics like ceftriaxone
(Rocephin) and ciprofloxacin (Cipro).
- Underlying illnesses: Some chronic illnesses are associated with kidney stone formation, including cystic fibrosis, renal tubular acidosis, and inflammatory bowel disease.
|Picture of a kidney stone
Must Read Articles Related to Kidney Stones
CT was discovered independently by a British engineer named Sir Godfrey Hounsfield and Dr. Alan Cormack. It has become a mainstay for diagnosing med...learn more >>
Cystoscopy is the use of a scope (cystoscope) to examine the bladder. This is done either to look at the bladder for abnormalities or to help with surgery being...learn more >>
Dehydration in Adults
Dehydration occurs when the loss of body fluids (mostly water), exceeds the amount that is taken in. Causes of dehydration include fever, vomiting, diarrhea, di...learn more >>
Patient Comments & Reviews
The eMedicineHealth doctors ask about Kidney Stones: