also: はらいた
noun
General term for pain in the stomach or abdominal area. Both readings are common; ふくつう is slightly more formal/medical, while はらいた is more casual.
昨日から腹痛が続いている。
I've had a stomach ache since yesterday.
腹痛で学校を休んだ。
I stayed home from school because of a stomach ache.