noun
tenesmus; painful, ineffectual urge to defecate
Medical and everyday term for cramping lower abdominal pain with a sensation of needing to pass stool but producing little or nothing; often associated with dysentery or irritable bowel.
食あたりで渋り腹になり、何度もトイレに駆け込んだ。
I got tenesmus from food poisoning and kept rushing to the bathroom.
渋り腹の症状が続くようなら、病院で診てもらった
If the tenesmus persists, you should see a doctor.
腹痛 is general abdominal pain, while 渋り腹 specifically refers to the cramping, ineffectual urge to defecate.
下痢 is diarrhea (loose/watery stool), whereas 渋り腹 is the painful sensation of needing to go with little result, though they can occur together.
Compound of 渋り (shiburi, 'hesitation' or 'reluctance', from 渋る shiburu) and 腹 (hara, 'belly'), referring to the hesitant, incomplete bowel movement sensation.