His mother said that he would have an operation in a few days. Should I send him a message?

Better call. You call him and ask him if he needs his help. Let me know if you need anything. It is best to visit as soon as possible after the operation.

Surgery refers to the treatment of the patient's body with medical instruments, such as excision and suture, the operation of knives, scissors, needles and other instruments in the local part of the human body, and the treatment process of removing lesions, changing structures or implanting foreign bodies with the help of external forces.