Puerperal infections are reproductive system infections during the puerperium. According to the site of infection, it is divided into local infection of perineum, vagina, cervix, abdominal wound, uterine incision, acute endometritis, acute pelvic connective tissue infection, peritonitis, thrombophlebitis, septicemia, etc. 1. Acute vulvovaginal, vaginal and cervical infections: perineal laceration or perineal lateral incision wound infection, manifested as perineal pain, difficulty in sitting, and may have hypothermia. When the infection site is deep, it can cause paravaginal connective tissue infection. 2. Uterine infection: In the case of endometritis, there is a large amount of purulent discharge with a foul odor in the vagina. In the case of myometritis, abdominal pain, increased purulent malaria, uterine pressure and pain, poor uterine regeneration, and systemic infection symptoms such as high fever, chills and headache may occur. 3, acute pelvic connective tissue infection and acute tubal inflammation: can be manifested as lower abdominal pain with anal swelling, may be accompanied by chills, high fever, pulse rate, headache and other systemic symptoms. 4, acute pelvic peritonitis and diffuse peritonitis: inflammation continues to develop and can form pelvic peritonitis. Subsequently, it develops into diffuse peritonitis with obvious symptoms of systemic toxicity, high fever, nausea, vomiting and abdominal distension. If the abscess spreads to the intestinal canal and bladder, diarrhea, urgency and difficulty in urination may occur. Incomplete treatment in the acute stage may develop into pelvic inflammatory disease sequelae and lead to infertility. 5. Thrombophlebitis: It is common 1-2 weeks after delivery, manifested as chills and high fever, and the symptoms can last for several weeks or recur. Thrombophlebitis of lower limbs is often secondary to pelvic phlebitis, manifested as flaccid fever, persistent pain in lower limbs, local venous pressure or palpable sclerosis, also can cause lower limbs edema, skin whitening. 6, sepsis: Infection thrombus off into the blood circulation can cause bacteremia, and continued development can be complicated by sepsis and migratory abscess. If a large number of pathogens enter the blood circulation, severe sepsis, infectious shock and multi-organ failure can be formed, manifesting as persistent high fever, chills, etc. or even life-threatening. In summary, fever, pain and abnormal malignant discharge are the three main symptoms of puerperal infection.