Spasmodic abdominal pain (5)
I believe the answer is:
colic
'spasmodic abdominal pain' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for colic that I've seen before include "Intestinal infection" , "suffering" , "Intestinal pain" , "gut reaction" , "unpleasant gut feeling" .)