One week after hernia surgery, there is still a low fever, due to wound infection, urinary tract infection is more serious, the low fever caused by common cold is usually not serious. 1. Wound infection: one week after hernia surgery, if the wound site appears painful, red and swollen, accompanied by purulent secretions, indicating that the patient has a wound infection. With the aggravation of the condition, the patient will have high fever, mental exuberance or depression, rapid pulse, respiratory distress and other symptoms, and even life-threatening in serious cases. 2. Urinary tract infection: the use of self-flowing urinary catheter may cause patients to develop urinary tract infection, which causes low-grade fever, and patients will also be accompanied by urinary pain, urinary frequency, urinary urgency symptoms. With the development of the disease, the patient will appear hematuria chills, generalized high fever. With the development of the disease, it may cause nephritis and other serious diseases. 3. Common cold: patients in the postoperative physical condition is poor, may lead to the occurrence of colds, resulting in patients with a week of postoperative low fever, the patient should do a good job of warmth, increase the amount of water to avoid aggravation of the condition. Please go to the hospital for examination and treatment in time if you have any physical discomfort after hernia surgery.