Sterilization does not cause weight gain or facial hair. A general or local anesthetic will be used. The choice depends on your physical condition and the method of sterilization being used. Local anesthesia is much safer than general anesthesia. There is less risk of serious complications, including death.
General anesthesia is entirely painless.
When a local anesthetic is injected, you may feel some discomfort. The pain is relieved with medications and sedatives. You will remain conscious but sleepy. You will feel little or no discomfort during the procedure. The discomfort you feel after the operation depends on your general health, the type of operation, and your tolerance of pain.