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Anesthesia
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Surgery Rehabilitation

Anesthesia

Anesthesia uses specialized medicines to prevent pain and ensure patient comfort during medical procedures, ranging from minor dental work to major surgery.

What is anesthesia?

Anesthesia is the use of medicines, called anesthetics, to prevent pain during surgery and other medical procedures. Medicine may be given by injection, inhalation, topical lotion, spray, eye drops, or a skin patch.

Anesthesia can cause a loss of feeling, awareness, or both. Sedation may be used with anesthesia. Unlike full anesthesia, sedation doesn't make you completely unconscious, and recovery is faster. It helps reduce pain, keep you calm, and make you less aware during procedures such as minor surgeries, endoscopies, imaging, or dental work.

Levels of sedation

  • Minimal sedation. You are awake but more relaxed.
  • Moderate sedation (conscious sedation). You may feel sleepy and not remember much, but you can still respond when spoken to or touched.
  • Deep sedation. You are very drowsy and may respond only to repeated or stronger stimulation.

What is anesthesia used for?

Anesthesia may be used for:

  • Minor procedures, such as filling a tooth.
  • Childbirth or procedures such as colonoscopies.
  • Minor and major surgeries.

In some cases, a dentist, nurse, or doctor may give you an anesthetic. In other cases, you may need an anesthesiologist. This is a doctor who specializes in giving anesthesia.

What are the types of anesthesia?

There are several different types of anesthesia:

  • Local anesthesia numbs a small area like a tooth or a cut that needs stitches. You are awake during local anesthesia.
  • Regional anesthesia numbs a larger area, like an arm, a leg, or everything below the waist. You may be awake during the procedure, or you may be given sedation. It may be used during childbirth, a Cesarean delivery (C-section), or minor surgeries.
  • General anesthesia affects your whole body. It feels like a deep sleep, but you do not feel anything. It is used during major surgeries, such as heart surgery, brain surgery, back surgery, and organ transplants.
  • Monitored sedation makes you relaxed or sleepy. You may be able to talk, depending on the level of sedation, and you probably won't remember the procedure. It may be used for a colonoscopy or dental work.

Your overall health, medical history, the procedure you're having, and other factors will help determine the type of anesthesia you receive.

What are the risks of anesthesia?

Anesthesia is generally safe. But there can be risks, especially with general anesthesia, including:

  • Heart rhythm problem (arrhythmia).
  • Breathing problems.
  • An allergic reaction to the anesthesia.
  • Temporary confusion (delirium), which can last several days in some people over the age of 60, or briefly in children after waking up from anesthesia.
  • Awareness when someone is under general anesthesia. This usually means that the person hears sounds. But sometimes they can feel pain. This is rare.

Talk to your health care provider about the benefits and risks of anesthesia.

Frequently Asked Questions

While anesthesia is generally very safe, potential risks include allergic reactions, breathing problems, changes in heart rate or blood pressure, and, rarely, more serious complications like stroke or heart attack. Individuals with existing medical conditions such such as heart disease, lung disease, diabetes, kidney problems, or those who are older, obese, or smoke, may be at a higher risk for complications. Your anesthesiologist will discuss your personal risks with you.
When you first wake up from anesthesia, you may feel groggy, disoriented, or confused. You will be monitored closely in a recovery area as the effects of the anesthesia wear off. The time it takes to become fully alert and ready for discharge varies widely depending on the type of anesthesia, the procedure performed, and your individual response. For minor procedures with local or moderate sedation, you might go home within an hour or two, while general anesthesia often requires a longer recovery period.
You will typically be instructed to fast, meaning no food or drink, for several hours before your procedure. It's crucial to follow these instructions precisely to prevent complications. You must also inform your anesthesiologist about all medications you are taking, including over-the-counter drugs, supplements, and herbal remedies, as some may need to be stopped or adjusted before anesthesia. Disclose any allergies or previous reactions to anesthesia.
Common side effects include nausea and vomiting, drowsiness, a sore throat (especially after general anesthesia), muscle aches, and shivering. These side effects are usually temporary and often resolve within a few hours to a day, depending on the type and duration of anesthesia used. Your care team will monitor you and provide medication to help manage these symptoms.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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