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.
After giving birth, the afterpains were so strong I couldn't sleep.
Afterpains occur as the uterus returns to its original size.
Compound of 後 (after) and 陣痛 (labor pains). The term directly describes the phenomenon of pains occurring after childbirth.