Clinically, surgeries involving bones tend to be more painful.

1. spinal fusion surgery. This type of surgery is to restore the patient's spine to a normal state through the mode of surgical grafting. Doctors will remove bones from other parts of the body and transplant them into the patient's spine, and patients tend to suffer from chronic pain after this type of surgery.

2. Spinal reconstruction surgery. Since the body's main nervous system is located around the spine, this type of surgery is not only delicate and long, but also very painful for both the patient and the surgeon.

3. Open heel surgery. This type of surgery tends to damage the nerves in the heel and the screws are in the bone, which can be very painful for the patient.

4. Hysterectomy. If the muscle fibers in the uterus are too large, it can cause infertility and open surgery is needed, while the whole procedure can be very painful.

5. Colorectal resection. This type of surgery usually involves the removal of the large intestine and rectum, and sometimes even the anus, from the diseased area.