Does general anesthesia affect long-term cognitive function?

For older adults, does general anesthesia cause lasting cognitive decline?

Yes, but the effect is small and often overshadowed by other factors like age, education, and health conditions. A large Dutch study followed 1,823 adults aged 25–84 over 12 years and found that more total time under general anesthesia was linked to slower thinking speed, worse attention, and slower information processing — even after adjusting for age, education, and health [3]. The decline was modest: for example, selective attention and mental speed scores dropped significantly (p < 0.001), but age and education were the strongest predictors overall.

A Mayo Clinic study of 1,819 adults aged 70–91 confirmed this pattern: after surgery under general anesthesia, global cognitive scores declined about 0.06 standard deviations per year faster than before surgery — a small but statistically significant change [7]. Importantly, this study found no difference between anesthetics with or without nitrous oxide (laughing gas), so avoiding that specific agent doesn't protect your thinking.

Your own pre-surgery brain health matters most. A 2025 study of 108,158 older adults found that those with pre-existing cognitive impairment (scoring 6 or higher on a dementia screening test) had a 35% higher risk of dying within 90 days after surgery under general anesthesia, and the risk climbed with worse scores — up to double the risk for the most impaired [1]. This means the anesthesia itself isn't the main danger; it's the combination of surgery, anesthesia, and your starting point.

Does general anesthesia affect children's long-term brain development?

For children, the answer depends heavily on age, number of exposures, and surgery type. A systematic review of 72 studies (2000–2022) found that two-thirds reported negative effects on learning, behavior, or brain structure after general anesthesia before age 18 [8]. The risks were highest for children under 7, those who had multiple or lengthy surgeries, and those undergoing major procedures. However, many studies were retrospective, so cause-and-effect isn't proven — sicker children may need more surgeries, and their underlying illness could contribute to later problems.

A smaller prospective study in children under 6 who had ear tube surgery found no difference in long-term quality of life or behavior between those who got general anesthesia versus local anesthesia, though the local anesthesia group showed more fear of healthcare workers later [6]. This suggests that for minor, single procedures, general anesthesia doesn't cause lasting cognitive harm.

Bottom line: a single, short anesthesia for a routine surgery appears safe for most children. But repeated or prolonged exposures, especially before age 7, warrant caution — doctors should limit anesthesia duration and doses when possible [8].

Does the type of anesthesia (spinal vs. general, or adding epidural) change long-term cognitive risk?

Surprisingly, no — the choice between spinal anesthesia (numbing the lower body) and general anesthesia doesn't affect long-term survival or recovery. A large randomized trial of 1,600 older adults having hip fracture surgery found no difference in survival or ability to walk at one year between spinal and general anesthesia [2]. Similarly, a trial of 1,802 elderly patients having major chest or abdominal surgery found that adding an epidural to general anesthesia didn't improve survival or cancer recurrence over 5.5 years [4].

What about adding special drugs? One study of 90 women having breast cancer surgery found that using S-ketamine (a type of anesthetic) during general anesthesia led to slightly better cognitive scores on the Mini-Mental State Exam one day after surgery, but the benefit disappeared by day two [5]. This suggests any cognitive advantage from specific anesthetic agents is short-lived.

The takeaway: for long-term brain health, the type of anesthesia matters far less than your age, pre-existing cognitive health, and the number of surgeries you've had. Focus on optimizing your health before surgery, not on choosing a specific anesthetic.

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