noun
afterpains; involution
Medical term for the cramping pain felt after childbirth as the uterus contracts back to its normal size. Also refers to the process of involution itself.
出産後、後陣痛が強くて眠れなかった。
After giving birth, the afterpains were so strong I couldn't sleep.
後陣痛は子宮が元の大きさに戻る過程で起こります。
Afterpains occur as the uterus returns to its original size.