Pyloric stenosis

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Digestive system Pyloric stenosis

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Pyloric stenosis

Pyloric stenosis is a narrowing of the outlet from the stomach to the small intestine (called the pylorus). The condition primarily occurs in infants.

This condition is caused by a thickening of the muscles of the pylorus. This prevents the stomach from emptying into the small intestine.

The cause of the thickening is unknown, although genetic factors may play a role. It occurs more commonly in boys than in girls and is rare in patients older than 6 months.

Approximately 2 to 3 of every 1,000 infants has pyloric stenosis.

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