Anal fissure surgery is most commonly performed under general anesthesia, which means you are asleep and do not feel pain during the operation. Depending on the procedure and your health, your surgical team may consider other options or add a local anesthetic to reduce pain afterward. The choice depends on the type of surgery, your medical history, and the anesthesiologist's assessment.
Which type of anesthesia is most commonly used?
For a common operation called lateral internal sphincterotomy, general anesthesia is frequently used. During this procedure, the surgeon makes a small cut in the internal anal sphincter, a muscle that helps control the opening of the anus. Relaxing this muscle can reduce pressure and help a persistent fissure heal.
According to Cleveland Clinic, most people having a lateral internal sphincterotomy receive general anesthesia, although alternative arrangements may be discussed with the healthcare provider. The operation is often performed as day surgery, meaning patients can usually return home on the same day if recovery goes well.
What are the anesthesia options for anal fissure surgery?
General anesthesia
General anesthesia uses medicines to make you temporarily unconscious. You will not be aware of the operation or feel pain while it is being performed. An anesthesia professional monitors you throughout the procedure and adjusts the medicines as needed.
This is a common choice for anal fissure surgery because it allows the surgeon to perform the operation while you are asleep. The exact medicines and methods used to give anesthesia depend on your health and the planned procedure.
Spinal or other regional anesthesia
Regional anesthesia blocks feeling in a larger area of the body. A spinal anesthetic, for example, involves injecting medicine into the lower back to numb the lower part of the body. You may remain awake, sometimes with medicine to help you relax, although the plan depends on the operation and the anesthesia team.
Spinal anesthesia may be considered for some procedures involving the anal area, but it is not the only alternative to general anesthesia. The surgical team will decide whether it is suitable for the operation and your individual circumstances.
Local anesthesia
Local anesthesia numbs a small area while you remain awake. It may be used for selected minor procedures or injected around the surgical site as an additional way to control pain after an operation. Whether local anesthesia alone is appropriate depends on the procedure and the circumstances.
According to the UK National Health Service (NHS), local anesthesia prevents pain signals from the treated area from reaching the brain. For anal fissure surgery, local anesthetic may also be combined with another type of anesthesia rather than used as the only method.
Sedation with anesthesia
Sedation uses medicines to help you feel relaxed or sleepy. It is not the same as general anesthesia, because sedation does not always make you fully unconscious. Depending on the procedure, it may be combined with local or regional anesthesia. Your team will explain whether sedation is part of your planned anesthetic.
How does the surgeon decide which anesthesia you need?
There is no single anesthetic plan that is best for every person having anal fissure surgery. Your surgeon and anesthesia professional consider the procedure being performed, your medical history, medicines, allergies, previous experiences with anesthesia, and any relevant health conditions. They will also consider your preferences where different options are suitable.
The operation itself matters. A lateral internal sphincterotomy, an examination under anesthesia, and a procedure involving an injection to relax the anal sphincter may have different anesthesia requirements. The team will explain the planned approach and whether an additional local anesthetic is likely to be used for pain relief.
The Guy's and St Thomas' NHS Foundation Trust describes anal fissure surgery as commonly being performed under general anesthesia. Before surgery, patients attend an assessment where the team reviews their health and medicines and discusses the procedure.
What happens before anesthesia is given?
Before surgery, you will usually have a preoperative assessment. The team will ask about your health conditions, regular medicines, allergies, and any previous problems with anesthesia. Tell them if you have had nausea, breathing difficulties, or an unexpected reaction during an earlier operation, as this information can help them plan your care.
You will receive instructions about when to stop eating and drinking, which medicines to take or pause, and when to arrive at the hospital. Follow the instructions given by your own care team rather than assuming that the same fasting rules apply to everyone.
The NHS guide to general anesthesia explains that the anesthesia team assesses patients before surgery and monitors their breathing, heart rate, blood pressure, and oxygen levels during general anesthesia.
What happens during and after anesthesia?
If you receive general anesthesia, medicines are usually given through a small tube in a vein, although other methods may sometimes be used. You become unconscious, and the anesthesia professional monitors you throughout the operation. You will wake up in the operating area or recovery room after the anesthetic medicines are stopped.
After surgery, staff check that you are recovering safely and help manage pain or nausea if these occur. General anesthesia can leave you feeling sleepy or unsteady for a while. If you have day surgery, you will usually need someone to take you home, and you should follow the hospital's instructions about supervision, driving, and other activities afterward.
Can you feel pain after anal fissure surgery?
You should not feel the operation itself when the anesthesia is working as intended. However, some discomfort, soreness, or pain can occur as the anesthetic wears off. Your surgeon may use local anesthetic around the surgical site and recommend suitable pain relief for recovery.
The amount of discomfort and the medicines needed afterward vary with the procedure and the individual. Ask your surgical team what pain relief they expect you to need, how to take it safely, and whom to contact if pain is not controlled by the plan they provide.
What are the possible side effects and risks?
All forms of anesthesia have potential side effects, although serious complications are uncommon. After general anesthesia, some people experience nausea, vomiting, a sore throat, or temporary drowsiness. Spinal anesthesia can cause effects related to numbing the lower body, while local anesthetic can cause temporary numbness in the treated area. The risks depend on the anesthetic used and your health.
Make sure your anesthesia professional knows about allergies, all medicines and supplements you take, and any significant health conditions. They can explain which risks are relevant to you and what steps will be taken to reduce them.
Questions to ask before your operation
If you are unsure what to expect, consider asking your surgeon or anesthesia professional:
- Will I have general anesthesia, spinal anesthesia, or another option?
- Will a local anesthetic also be used to help control pain after surgery?
- How should I prepare, including fasting and taking my usual medicines?
- Will I need someone to take me home and stay with me afterward?
- What should I do if I have pain, nausea, or another concern after discharge?
For most people undergoing a standard anal fissure operation, general anesthesia is a common approach. The best plan for you depends on the operation and your health, so confirm the intended anesthetic with your surgical team before the procedure.