Which condition is characterized by abrupt onset and episodic abdominal pain in a previously healthy child?

Intussusception is characterized by the abrupt onset of episodic abdominal pain in a previously healthy child. This condition occurs when a segment of the intestine telescopes into an adjacent segment, which can lead to obstruction and potential ischemia. The pain is often severe and intermittent, with episodes sometimes lasting for a short time before resolving only to return later.

In children, this condition can manifest with the child appearing well between pain episodes, which is distinctive and can lead to a diagnosis challenge if not recognized quickly. Additionally, the associated symptoms may include vomiting, "currant jelly" stools (which is a sign of blood mixing with mucus), and sometimes a palpable abdominal mass.

Other conditions may also present with abdominal pain, but they typically have different characteristics. For instance, appendicitis usually presents with more continuous pain that worsens over time and is often accompanied by fever and a more gradual onset. Gastroenteritis tends to present with diffuse abdominal pain along with diarrhea and vomiting, but the onset is usually tied to infection with more systemic symptoms. Constipation can cause abdominal discomfort and pain, but it is often more chronic rather than episodic and sudden in onset. Thus, the distinctive pattern of pain in intussusception aligns well with this