Acupressure on Postoperative Ileus in Patients With Colorectal Cancer Surgery

The goal of this clinical trial is to learn about acupressure in patients with colorectal cancer surgery. The main questions it aims to answer are: * whether acupressure can improve the motility of vagus nerve in patients after colorectal cancer surgery * whether acupressure can reduce the inflammatory response of the body * whether acupressure can reduce the incidence of gastrointestinal paralysis in patients after colorectal cancer surgery Participants will receive acupressure at ST36 twice daily starting from the first day after surgery and lasting for five days. Researchers will compare usual care group to see if acupressure has those above effects.