Specialty5 min read

Anesthesiology

Organ or systemHeartOrgan

Detail level

An anesthesiologist is a physician who manages patients before, during and after surgical and diagnostic procedures, including control of pain and awareness.

According to AMA FREIDA: anaesthesiology includes "perioperative management of patients" during surgical and diagnostic procedures, from preparation beforehand to maintaining normal body functions and treating pain afterwards. According to MedlinePlus: anaesthesia is "the use of medicines called anaesthetics to prevent pain during surgery and other medical procedures", and in complex cases it is given by an anaesthetist (anaesthesiologist). MedlinePlus summarises it as "anaesthesia".

FREIDA states that the physician's role is "keeping patients alive during interventional procedures" by controlling consciousness, pain response, memory and muscle strength, and that practice has expanded to post-operative pain management, intensive care and chronic pain treatment. MedlinePlus describes the types of anaesthesia: local (numbs a small area while the patient is awake), regional (a larger area such as an arm, a leg or the lower half of the body), general ("like a deep sleep, and you feel nothing") and monitored sedation. It lists possible complications including arrhythmias, breathing difficulties, allergic reactions, temporary confusion (especially in older people) and, rarely, awareness during the operation. This page does not cover fasting advice or pre-anaesthetic assessment; anaesthesia options and their risks are discussed with the anaesthetist.

In one minute¹²³

What is it?: The specialty of managing the patient around operations and procedures: anaesthesia, pain control and monitoring, extending to intensive care and pain treatment.
Who is usually affected?: People who need surgery, a diagnostic procedure or a caesarean section, or intensive care or chronic pain patients.
Acute or chronic?: Assessment before the procedure, then anaesthesia and monitoring during it, then pain management afterwards.
Main symptoms: It does not treat symptoms in itself; its role is tied to the procedure.
Red flags?: The complications of anaesthesia mentioned in MedlinePlus (difficulty breathing and severe allergy) are emergencies; this page does not cover detailed lists of danger signs.
Preventable?: This page does not cover pre-anaesthetic instructions; follow the instructions of the surgical and anaesthesia team.

What is it?

According to FREIDA: anaesthesiology is "perioperative management of patients" during surgical and diagnostic procedures, and includes preparation beforehand, maintaining normal body functions, and treating pain afterwards. MedlinePlus defines anaesthesia as "the use of medicines called anaesthetics to prevent pain during surgery and other medical procedures", and it may cause loss of sensation or consciousness or both. MedlinePlus states that an anaesthetic may be given by dentists, nurses or doctors, and for complex cases by an anaesthetist.

Conditions it covers

According to FREIDA, anaesthesiologists treat critically ill patients, cardiac arrest, and acute and chronic pain, and work in hospitals, medical centres, day-surgery centres and clinics; in a single morning they may face an emergency caesarean section, a routine tonsillectomy and a car accident casualty. Their subspecialties include cardiac anaesthesia, intensive care, pain medicine, obstetric anaesthesia, paediatric anaesthesia, regional anaesthesia and palliative medicine.

Related pages on this site: general surgery, obstetrics and gynaecology, paediatrics, trauma and the heart. MedlinePlus states that anaesthesia is used in surgery generally, including heart, brain and organ transplant surgery, and in childbirth and caesarean section; FREIDA mentions obstetric, paediatric and cardiac anaesthesia and the car accident casualty. The references of this page do not name general surgery or trauma medicine, so the link to them is general and not exclusive.

Common tests and procedures

MedlinePlus describes the types of anaesthesia: local (such as a tooth or a wound needing stitches), regional (such as an arm, a leg or the lower half of the body, and it may be used in childbirth and caesarean section), general, and monitored sedation. Possible complications include arrhythmias, breathing difficulties, allergic reactions, temporary confusion and, rarely, awareness during the operation. Choosing the suitable type is done with the anaesthetist; this page does not cover the criteria for selection or pre-anaesthetic tests.

When to see one

FREIDA states that preparation includes three years of residency after at least one prior year of training (US details).

Referral to the specialist is usually decided by the primary care provider according to the condition (MedlinePlus). The patient usually meets the anaesthetist as part of the operating team; this page does not cover detailed criteria.

When do you need urgent help?

Call emergency services now 998

Difficulty breathing, swelling of the face or tongue, fainting or severe confusion after anaesthesia or a medicine: seek emergency care immediately through your local emergency number. (A conservative general warning based on the list of emergency signs in MedlinePlus; this page does not cover signs specific to the period after anaesthesia.)²⁴

Educational content only — no diagnosis, and no substitute for a clinician.

Common questions

Is anaesthesia always given by an anaesthetist?

According to MedlinePlus, anaesthetics may be given by dentists, nurses or doctors, and in complex cases by an anaesthetist. (Systems may differ in your country.)²

Questions for your doctor

What type of anaesthesia is suitable for my procedure, and why?
What are the possible complications in my case, and what are my risk factors?
Should I stop my medicines or fast before the procedure?
How will pain be controlled after the procedure?
What should I expect on waking, and when will I recover?

References

1
AMA FREIDA. Anesthesiology — specialty description. freida.ama-assn.org/specialty/anesthesiology
Educational & historical references · Accessed 2026-10-06
2
MedlinePlus. Anesthesia. medlineplus.gov/anesthesia.html
Health agencies & guidelines · Accessed 2026-10-06
3
MedlinePlus. Types of health care providers. medlineplus.gov/ency/article/001933.htm
Health agencies & guidelines · Accessed 2026-10-06
4
MedlinePlus. Recognizing medical emergencies. medlineplus.gov/ency/article/001927.htm
Health agencies & guidelines · Accessed 2026-10-06

Review status: Edited content · Last updated: 2026-10-06

Change log

2026-10-06 — Page created.