Procedure prep
Fasting Before Anal Fistula Surgery
Anal fistula surgery treats a small tunnel that runs between the inside of your back passage and the skin nearby. It is usually a quick day-case operation, and most people go home the same day.
Fasting for this procedure
→ Get your exact fasting times with the calculator
Medicines to check
- Blood thinners (aspirin, clopidogrel, warfarin, Eliquis, Xarelto) — see medications to stop.
- Diabetes medicines & insulin — they need a plan. See diabetes tablets.
- Blood pressure medicines — confirm which to take with a sip of water.
- NSAID painkillers (ibuprofen, naproxen) — ask whether to pause these, as they can affect bleeding.
- Stool softeners or laxatives — keep taking any your team has prescribed so your first bowel motion is soft and comfortable.
When this surgery may be delayed
- Fever, a new cough/cold, or a chest infection
- Vomiting or diarrhea
- An active skin infection or new abscess near the surgery area
- A positive or unknown pregnancy test
- Skipping or wrongly timing your fasting instructions
Reports & documents to carry
- Photo ID and your insurance or hospital paperwork
- A list of all your medicines, including doses and any blood thinners
- Any relevant scans or letters about the fistula (MRI or ultrasound)
- A responsible adult to take you home after general or spinal anesthesia
- Loose, comfortable clothing and any sanitary pads for after surgery
What to ask your anesthesia team
- Will I have general or spinal anesthesia?
- Which of my regular medicines should I hold, and which can I take with a sip of water?
- Will you place a seton (a soft thread), and what does that mean for my recovery?
- When can I eat and drink again, and will I go home the same day?
- What pain relief, stool softeners, and sitz bath routine should I use at home?
Your prep checklist
Tick things off as you sort them — saved on this device only, nothing is sent anywhere.
A general guide — your hospital's own instructions always come first.
Frequently asked questions
Will I need bowel prep or an enema before anal fistula surgery?
Most people do not need full bowel prep for this operation. Sometimes the team gives a small enema on the morning of surgery to clear the lower bowel. Your hospital will tell you if this applies to you — follow their specific instructions.
What is a seton and why might I need one?
A seton is a thin, soft thread the surgeon may loop through the fistula. It keeps the tunnel draining and helps it heal gradually while protecting the muscles that control your bowels. If one is placed, your team will explain how long it stays in and how to care for it.
How do I manage going to the toilet after surgery?
The first bowel motion can feel daunting, but keeping your stool soft makes it much easier. Stool softeners, plenty of water and fiber, and warm sitz baths several times a day all help soothe the area and keep things clean. Your team will give you a routine to follow.
How soon can I go back to normal activities?
Many people return to light activity within a few days, though full healing of the wound can take several weeks. Avoid heavy lifting and strenuous exercise until your surgeon says it is safe. Always follow the recovery timeline your own team gives you.