What symptom is associated with pyloric stenosis in infants?

Pyloric stenosis is a condition in infants characterized by the narrowing of the pylorus, the opening from the stomach into the small intestine. This narrowing leads to an obstruction that prevents food from passing effectively into the intestines. One of the hallmark symptoms of this condition is projectile non-bilious vomiting.

In infants with pyloric stenosis, the vomit is typically forceful and can occur shortly after feeding, often projecting several feet away from the infant. The vomiting is non-bilious because the obstruction is located before the entry of bile from the liver into the digestive system, meaning that the contents of the vomit come primarily from the stomach.

This symptom can lead to significant dehydration and electrolyte imbalances if not addressed promptly, making it a critical sign for diagnosis. Infants with pyloric stenosis may also show signs of hunger shortly after vomiting, as they are still hungry but unable to retain food due to the obstruction. Understanding these symptoms is crucial for early recognition and management of the condition.