Likely cause
Before anesthesia, doctors ask you to fast and may adjust some medicines to reduce the risk of vomiting, food entering the lungs (aspiration), bleeding, or problems with blood sugar and blood pressure during surgery. The exact instructions depend on the type of surgery, your age, medical conditions, and the medicines you take. Always follow the instructions given by your surgeon or anesthesiologist, even if they differ from general advice.
What to watch for
Tell your doctor before surgery if you have fever, cough, sore throat, breathing difficulty, vomiting, diarrhea, chest pain, or any new illness. Also inform them about allergies, loose teeth, pregnancy (or if pregnancy is possible), sleep apnea, previous anesthesia problems, and all medicines, supplements, or herbal products you use. Do not hide smoking, alcohol, or recreational drug use, as this can affect anesthesia safety.
What you can do
Most adults are advised not to eat solid food for at least 6-8 hours before anesthesia. Clear liquids such as plain water may be allowed up to 2 hours before surgery, but only if your hospital advises it. Take only the medicines your doctor has told you to continue. Some medicines, such as blood thinners or certain diabetes medicines, may need to be stopped or adjusted—never stop them on your own. Remove nail polish, contact lenses, jewelry, and dentures if instructed. Carry your medical records, investigation reports, and a list of your medicines. Arrange for someone to take you home after the procedure if it is a day-care surgery.
When to see a doctor
Contact your surgeon or hospital before the procedure if you develop a fever, cough, breathing problems, vomiting, diarrhea, or any new illness, or if you accidentally eat or drink after your fasting has started. They will advise whether your surgery can proceed safely or needs to be postponed.
This is general information from a verified doctor and is not a diagnosis or a substitute for an in-person consultation. In an emergency, seek immediate medical care.
