For Patients › Types of anesthesia

The main kinds of anesthesia, explained

Start from the technique itself: what each one is, whether you are awake or asleep, what part of the body it affects, and the situations where it is commonly used.

This is general education about what may be used, not a plan for you. Your anesthesiologist decides based on your health, your procedure and the circumstances on the day — and will discuss it with you beforehand.

Spinal, epidural and nerve blocks are all forms of regional anesthesia — they numb one part of the body while you stay awake. They appear separately below because they are placed differently and feel different. Local anesthesia — numbing of the area being operated on, and nothing more — is often used on its own for small procedures, or together with sedation.

General anesthesia

Medication that keeps you fully asleep for the whole operation, with your breathing supported and monitored throughout.

Awake or asleep: Fully asleep. You are not aware of the operation.
What it affects: Your whole body. A breathing tube is often used to protect the airway while you sleep.

Commonly used for

Most general surgery — gallbladder removal, hernia repair, appendix surgery.
Most ENT surgery, because the operation often involves the airway itself.
Gynecologic cancer surgery, sometimes combined with an epidural or spinal for pain relief.
Longer or open urology procedures, and larger or longer plastic surgery.
Wisdom teeth removal and major oral surgery.
Cesarean section in emergencies, or when regional anesthesia is not suitable.

What you may feel

A drip (IV) is placed first, and the medicine is given through it.
You wake up in the recovery area, where your breathing is monitored closely.
A mild sore throat or hoarseness is common if a breathing tube was used.
Nausea afterwards is common and treatable.

Advantages

You are unaware and completely still for the whole operation.
The airway is protected, which matters when the surgery involves the airway itself.
Suited to long or complex operations.

Things to keep in mind

Sore throat and nausea are the usual after-effects, and both are treatable.
You will need an escort home, and should plan to rest for the remainder of the day.
Fasting instructions apply.

Where this comes from: General surgery, ENT, Oncogynecology guides.

Sedation

Medication that makes you relaxed and drowsy while you keep breathing on your own. It is often given alongside local or spinal anesthesia, which does the numbing.

Awake or asleep: In between — drowsy and relaxed rather than fully asleep. You may not remember much.
What it affects: Your awareness and comfort, not sensation. Numbing comes from the local or regional anesthesia given with it.

Commonly used for

Dental and oral surgery, particularly where there is dental anxiety, and for more complex work.
Shorter, minimally invasive urology procedures.
Alongside spinal anesthesia in orthopedic surgery, to keep you comfortable.
Plastic surgery where local anesthesia alone would not be comfortable.
Some minor ENT procedures.

What you may feel

Relaxed and drowsy; many people remember little of the procedure.
You keep breathing on your own.
You are monitored throughout, as you are for general anesthesia.

Advantages

Lighter than general anesthesia.
Often the option offered when anxiety is the main difficulty.
Safe when given by trained professionals with monitoring.

Things to keep in mind

Drowsiness lasts afterwards — no driving that day, and you need an escort home.
Fasting instructions apply when sedation is planned.
It does not numb on its own; something else provides that.

Where this comes from: Dental, Urology, Plastic surgery guides.

Spinal anesthesia

A single injection in the lower back that numbs you from roughly the chest down, while you stay awake.

Awake or asleep: Awake. You can be lightly sedated as well, where you prefer that and it is safe.
What it affects: The lower half of the body. Feeling and movement return over a few hours.

Commonly used for

Most planned cesarean sections.
Knee and hip replacement, very often together with a nerve block — see orthopedic surgery.
Many minimally invasive urology procedures, such as cystoscopy.
Some general surgery, instead of or alongside general anesthesia.

What you may feel

It is given with you sitting or lying on your side, and works within minutes.
You may feel pulling and pressure during surgery, but not sharp pain.
Your legs feel heavy and numb for several hours.

Advantages

You stay awake — after a cesarean, you can meet your baby right away.
No breathing tube is needed.
For joint replacement, a spinal with a nerve block is common and can speed recovery.

Things to keep in mind

Blood pressure can drop shortly afterwards — common, and quickly treated.
Temporary difficulty passing urine can occur.
Headache afterwards is uncommon, and treatable.
Blood thinners affect whether a spinal is safe and when it can be given — tell your team about all your medicines.

Where this comes from: C-section, Orthopedic, Urology guides.

Epidural

Pain relief given in the back that can be topped up and kept going during and after the operation.

Awake or asleep: Awake when it is used on its own, as in childbirth. For larger surgery it is usually combined with general anesthesia, purely for pain relief.
What it affects: Pain from the part of the body the operation involves. In childbirth, the lower body.

Commonly used for

Labor. If a labor epidural is already in place, it can often be topped up for a cesarean section, avoiding a separate spinal.
Gynecologic cancer surgery, alongside general anesthesia, for pain relief during and after.
Some general surgery, as one option for pain relief alongside general anesthesia.

What you may feel

It is placed in the back, as a spinal is.
You may feel pressure and movement, but not sharp pain.
Afterwards it can keep working, giving pain relief in the first days after major surgery.

Advantages

It can be continued after surgery — an epidural or a patient-controlled analgesia (PCA) pump gives excellent pain relief in the first days.
Where a labor epidural is already in place, it can often be used for the cesarean.

Things to keep in mind

Headache after a spinal or epidural is uncommon, and treatable.
Blood thinners affect the safety and the timing of an epidural.
Tell your team about back problems, bleeding disorders, or previous anesthesia issues.

Where this comes from: C-section, Oncogynecology guides.

Regional anesthesia and nerve blocks

An injection near nerves that numbs a specific area and gives strong pain relief after surgery. Spinal and epidural anesthesia are also regional techniques; a nerve block targets one limb or region.

Awake or asleep: Either. A block may be placed while you are awake, sedated, or already asleep, and is often combined with a spinal or with general anesthesia.
What it affects: One limb or one part of the body. It is placed using ultrasound guidance.

Commonly used for

Orthopedic limb surgery — often combined with spinal anesthesia for knee and hip replacement.
Some general surgery, combined with general anesthesia to help with pain relief.

What you may feel

The numb limb may feel heavy and weak for several hours.
The block wears off gradually — start your pain medication before it fully wears off.

Advantages

It can keep the limb pain-free for many hours after surgery, reducing the need for strong opioids.
It adds to a spinal or to general anesthesia rather than replacing them.

Things to keep in mind

Temporary numbness or weakness in the blocked limb is expected, and resolves.
Nerve injury is rare — report numbness or weakness that persists.
Blood thinners affect the timing and safety of a block.

Where this comes from: Orthopedic, General surgery guides.

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Educational information only. This page describes anesthesia techniques in general and is not a substitute for medical advice. Always follow the instructions from your own surgical and anesthesia team.