Short answer
It means you agree to an operation freely, with the capacity to decide, after being given the information you need: what the operation involves, its likely benefits, its risks, the reasonable alternatives and what happens if you do nothing.12 In the UK, doctors must make you aware of the risks that matter to you personally, not only the ones they consider important.3 Signing a form records consent, but the real test is whether the conversation before it was complete, understood and free of pressure.
Key points
- Valid consent must be voluntary and informed, and given by someone able to make the decision.1
- Information should cover benefits, harms, reasonable alternatives and the option of no treatment.2
- Since 2015, UK law requires disclosure of risks that are material to the individual patient.3
- You can withdraw consent at any point before the procedure.1
- For cosmetic treatment, UK doctors must seek consent themselves and give time to reflect.4
The three conditions for valid consent
The NHS describes consent to treatment as giving permission before any test, examination or treatment, and sets out what makes it valid.1
- Voluntary: the decision is yours, free from pressure by staff, friends or family.1
- Informed: you have the full picture, including risks, benefits, alternatives and what happens if you decline.1
- Capacity: you can understand the information and use it to make the decision. UK doctors must start from the presumption that adults have this capacity.12
Consent can be spoken, written or shown by actions. For surgery it is normally written on a consent form,1 but the form is a record of the decision, not the decision itself.
What information you should be given
The General Medical Council (GMC), which regulates UK doctors, describes decision making as an ongoing dialogue. Its principles say doctors should find out what matters to you and share information about the benefits and harms of the proposed options and reasonable alternatives, including the option to take no action. You also have the right to the time and support needed to understand that information.2
In practice, before surgery you would expect to understand:
- What the operation involves, including the type of anaesthesia and the likely scars.
- What it can realistically achieve, and its limitations.5
- Common temporary effects, recognised complications and rare serious ones.
- Alternatives, including non-surgical options and not having treatment.2
- Recovery, aftercare and what happens if something goes wrong.5
Material risks: the Montgomery ruling
In 2015 the UK Supreme Court’s decision in Montgomery v Lanarkshire Health Board changed what counts as enough information. The Royal College of Surgeons of England summarises it this way: doctors are no longer the sole judges of which risks are material, and must take reasonable steps to make sure patients know about all risks that are material to them.3
A risk can be material because of how often it happens, how serious it is, or because of something about your own life. A small risk of nerve injury affecting the voice may matter far more to a singer than to most people, for example. This is why the conversation should include your circumstances, not just a standard list.
Cosmetic surgery and treatment abroad
Cosmetic procedures are elective, so the standard for consent is high. GMC guidance for doctors who offer cosmetic interventions expects them to obtain consent from the patient themselves, to discuss outcomes, benefits and risks clearly, and to give patients time to reflect.4 The NHS advises two consultations with the treating surgeon, with a cooling-off period that is normally two weeks in the UK.5
Abroad, practical obstacles can weaken consent. The first meeting with the surgeon may be on the day of surgery, the conversation may be in a second language, and travel already booked can create pressure to go ahead. The NHS suggests checking that the surgeon speaks a language you understand.5 US travel health guidance also notes that people treated abroad may not have the same legal recourse if complications arise, and should know their rights before agreeing to travel.6
| Signs consent is being taken well | Signs to be cautious |
|---|---|
| Discussion with the surgeon who will operate | Consent discussed only with a coordinator or salesperson |
| Risks explained in relation to your situation | A form handed over to sign without discussion |
| Alternatives, including no treatment, discussed | Only one option presented |
| Time between the discussion and the operation | Consent taken just before surgery for the first time |
| Written information you can take away | Pressure from time-limited offers or non-refundable payments |
Common questions
Can I change my mind after signing the consent form?
Yes. The NHS states that you are entitled to withdraw consent if you change your mind at any point before the procedure.1 Any financial consequences depend on the contract, which is why refund terms are worth checking in advance.
Does the surgeon have to tell me about every possible risk?
Not every conceivable one, but every risk that is material to you.3 If something matters to you, such as scarring, time off work or effects on a hobby, say so.
Can I bring someone with me to the consent discussion?
Usually, yes, and it can help you remember and ask questions. The decision must still be yours, free from pressure by anyone, including family.1
Is consent online or by video valid?
Discussion can begin remotely, but for cosmetic surgery UK expectations include a face-to-face consultation; see whether a video consultation is enough.
Bottom line
Informed consent is a conversation, not a signature. You should understand the benefits, risks that matter to you, alternatives and the option of doing nothing, and have time to decide without pressure.
Related reading
- Medical travel: planning, safety and aftercare
- Is a Video Consultation Enough Before Surgery Abroad?
- How Can You Be Sure Who Will Actually Perform Your Surgery?
- What Should You Check Before Paying a Deposit for Treatment Abroad?
Sources
- NHS. Consent to treatment. NHS website; 2022. https://www.nhs.uk/conditions/consent-to-treatment/ Accessed 5 November 2026.
- General Medical Council (GMC). Decision making and consent: the seven principles of decision making and consent. GMC; 2020. https://www.gmc-uk.org/ethical-guidance/ethical-guidance-for-doctors/decision-making-and-consent/the-seven-principles-of-decision-making-and-consent Accessed 5 November 2026.
- Royal College of Surgeons of England. Consent: supported decision-making. Royal College of Surgeons of England; undated. https://www.rcseng.ac.uk/standards-and-research/standards-and-guidance/good-practice-guides/consent/ Accessed 5 November 2026.
- General Medical Council (GMC). Guidance for doctors who offer cosmetic interventions. GMC; 2016. https://www.gmc-uk.org/ethical-guidance/ethical-guidance-for-doctors/cosmetic-interventions Accessed 5 November 2026.
- NHS. Cosmetic surgery abroad. NHS website; 2022. https://www.nhs.uk/tests-and-treatments/cosmetic-procedures/advice/cosmetic-surgery-abroad/ Accessed 5 November 2026.
- Stoney RJ, Leidel L. Medical tourism. CDC Yellow Book: Health Information for International Travel, 2026 edition. Centers for Disease Control and Prevention; 2025. https://www.cdc.gov/yellow-book/hcp/health-care-abroad/medical-tourism.html Accessed 5 November 2026.
Article history
- — First published.