It is not normal for the malaria to suddenly turn red 24 days after delivery. This situation mainly suggests the following possibilities: first, the patient has vaginal bleeding caused by uterine cavity infection, accompanied by discomfort such as bleeding, bad odor and pain in the abdomen. The diagnosis can be clarified by doing ultrasound, gynecological internal examination as well as routine blood and C-reactive protein tests. Secondly, the patient should be considered to have residual uterine cavity, such as placenta residue or chorionic villus residue, which causes bleeding, mostly without discomfort. Thirdly, the patient should be considered to have poor uterine regeneration or poor healing of the incision in women who had a cesarean section, in which case ultrasound and blood tests should be done to clarify the diagnosis. Fourthly, we should consider that the patient may have trophoblastic disease that causes bleeding, and ultrasound, blood chorionic gonadotropin or CT tests are needed to make a clear diagnosis.