Does waiting for surgery harm you? It depends on the condition.

Heart bypass

On a heart waiting list, a death figure means little until you know who was on it. A rate per 100 patient-years is close to a yearly percentage, and imperative means the group triaged as needing surgery soonest.

Death rates on the list were highest in the group already triaged as needing surgery soonest. That is what triage is meant to reflect, and it means the same wait carried different risks for different groups.

The same Swedish group then asked what a longer wait does to the result of the operation. No independent link was found between the length of the wait for bypass surgery and death after the operation, in a 2005 analysis by the Swedish research group behind the 2004 cohort, of 5,453 people who had bypass surgery, over a mean 24 months of follow-up, after adjusting for age, sex, operative risk and angina symptoms; deaths after surgery were higher before adjustment in people operated on after their intended waiting time (8.0 against 6.2 percent), and the authors say the result does not exclude subgroups who would benefit from a shorter wait.

A larger British Columbia study looked at how long the list was when patients registered. 0.8 percent against 1.6 percent of semi-urgent and non-urgent bypass patients died on the waiting list within 52 weeks of registering, on lists with an expected clearance time of a month or less against more than a month, among 8,451 semi-urgent and non-urgent patients, within a cohort of 8,966 people registered for isolated bypass surgery in British Columbia between 1991 and 2000; after adjustment the odds of dying before surgery were 64 percent higher on the longer lists (odds ratio 1.64, 95 percent confidence interval 1.02 to 2.63).

A smaller Nova Scotia study measured something different: it followed the waits of one centre’s left main disease patients. 4 of 561 people with left main coronary artery disease, scheduled for bypass surgery in Nova Scotia between April 1999 and March 2003, died while waiting; waiting time was not significantly linked to death or complications, although the authors warn that the study may have been too small to show a difference, and 52 people (9.3 percent) were moved to a more urgent queue because they got worse while waiting.

These studies are of bypass surgery. The Swedish cohort also included some patients whose bypass was planned together with aortic valve surgery, and we used no study of waits for valve surgery on its own. For your own case, the specific question is which priority group you are in and what would move you into a higher one. Our page on cardiac surgery says which cases we decline, and urgent or unstable ones are on that list.

Sciatica and lumbar stenosis

A Dutch trial tested timing in sciatica by randomising the decision itself: operate early, or try prolonged non-surgical care first and operate later if needed.

Those given early surgery felt better sooner, which is a real benefit. Follow-up at two and five years asked whether the advantage lasted. No significant difference in disability or in the share with a satisfactory recovery was found between the early-surgery and prolonged non-surgical care groups of the same Dutch randomised trial of 283 adults with sciatica at 2 years, and no significant group differences were found at 5 years, when 82 percent were followed up; about a fifth of patients overall still reported an unsatisfactory recovery, whichever group they were in, and 46 percent of the non-surgical care group had been operated on by 5 years.

That trial compared timing strategies, and it excluded cauda equina syndrome, severe weakness and stenosis. For stenosis, one Canadian centre followed its own patients. A one-centre observational Canadian study of 166 people with lumbar spinal stenosis (referred between February 2006 and June 2010, median wait 349 days from referral to surgery) found that quality-of-life scores worsened during the wait whatever its length, that those who waited 12 months or less improved more one year after surgery than those who waited longer, and that the difference was no longer significant two years after surgery.

The shorter-wait group there started with worse scores, which the authors attribute to triage, so the two groups were not like for like. A larger registry looked across several kinds of degenerative lumbar surgery. A 2025 Canadian registry study of 2,281 adults who had surgery for degenerative lumbar conditions, enrolled between January 2015 and December 2020, found higher odds of a meaningful improvement in disability at 12 months in those treated within 3 months or within 6 months of primary-care referral, and no significant difference for those treated within 12 months; the paper reports that people treated sooner had worse scores to begin with.

NICE says when to consider surgery for sciatica that is not progressive. NICE guideline NG59 on low back pain and sciatica, published in November 2016 and last updated in July 2026, says to consider spinal decompression for people with sciatica when non-surgical treatment has not improved pain or function and their imaging findings are consistent with their symptoms; it does not say how long anyone should wait for the operation.

Our spine page lists questions worth putting to any spine surgeon, and one of them asks what happens if you wait. Ask too what non-surgical treatment they want you to try first.

Which of these studies looks most like you is a question for the clinician who has examined you. If you want an independent opinion alongside theirs, the free call comes first, and nothing needs to be sent before it.

You don’t need a study to ask sensible questions. These five are worth having ready before your next appointment or phone call.

What three health services publish

Three health services publish patient guidance on waiting, and one lists questions.

England’s standards cover updates and what to do if your health changes. At least every 12 weeks is how often NHS England’s minimum standards for planned care, published in July 2026, say patients waiting in England should receive an update confirming they are still on the list; the same standards say patients should be told what to do if they are concerned about their health, including how to recognise when they may need urgent or emergency care, and they point a patient whose health changes while waiting to NHS 111 for urgent help that is not life-threatening, to 999 or an accident and emergency department for a life-threatening emergency, and to the GP practice for a new non-urgent concern.

New South Wales Health has a fact sheet for people who have been waitlisted. NSW Health’s patient fact sheet for people waitlisted for elective surgery in New South Wales says to talk to a GP if a condition changes or gets worse while waiting, to call the emergency number or go to an emergency department if urgent care is needed, and that the hospital’s confirmation letter states the urgency category the specialist has recommended.

Saskatchewan is the one that lists questions. The Government of Saskatchewan’s patient page on navigating surgical care says a patient’s surgical priority is determined by their clinical diagnosis, that the surgeon records the diagnosis on the surgical booking form, and that each diagnosis is assigned a priority level from consensus guidelines among surgeons; it also suggests asking what to do if a condition gets better or worse while waiting and whether a patient with a flexible schedule can be contacted on short notice if there is a cancellation.

For back pain and sciatica, NICE publishes general guidance on staying active and on exercise, though it does not address waiting for surgery, so ask your surgeon or physiotherapist what suits you. NICE guideline NG59 advises, in its general guidance for low back pain and sciatica and not specifically for people waiting for surgery, that people are given self-management advice that encourages them to continue normal activities, and says to consider a group exercise programme for an episode or flare-up; it also advises considering other diagnoses if new or changed symptoms develop.

When the wait is not the plan

Some symptoms need your local emergency service or urgent local assessment now: new or worsening chest pain, stroke symptoms including a recent mini-stroke, a sudden change in vision, weakness that keeps getting worse, numbness around the genitals or buttocks, difficulty passing urine, loss of control of your bladder or bowels, or symptoms in both legs. If you are unsure, use your local urgent advice line, such as NHS 111 in England, rather than waiting for your own team. This is general safety advice, not a finding of any study. For any other change that worries you, contact your GP or the number your waiting-list information gives for symptoms, and ask what they want to hear about. We would not arrange treatment abroad for any of these, because arranging it takes weeks.

Our page on when not to travel abroad for surgery covers the other situations where staying put is the better decision, and the vascular surgery page shows how tight the timing can be after a mini-stroke.

On the free 30 minute call we tell you honestly whether an independent opinion would help you, and some people are told they do not need one. We do not diagnose, prescribe or treat, so whether your own wait is safe stays a question for your own clinician. No hospital pays us anything (see how we are paid).