A diagnosis that does not fit is a difficult thing to live with. So is treatment adjusted for two years without much changing. In both cases the useful question is not whether the first clinician was wrong, but whether fresh eyes would reach the same conclusion.
That is what a second opinion is for. It is a normal part of medicine, and asking for one is not a complaint.
When it is worth asking for
The diagnosis is in doubt. You were told you have one condition and it has never quite matched your experience, or you were given a label quickly and it has followed you around since. This is common where conditions overlap: depression and ADHD both cause poor concentration, bipolar disorder is often diagnosed as depression first, and trauma can look like almost anything.
Treatment is stuck. You have taken several medicines at adequate doses for adequate lengths of time and are not much better. A fourth may be right, but it is worth asking whether the diagnosis explains why the rest did not work.
Something has been missed. Adult ADHD and autism are the clearest examples: both are frequently diagnosed late and both can look like anxiety or depression from outside. So can an untreated sleep disorder, a thyroid problem or long-term alcohol use.
A big decision is coming. Starting long-term medication, stopping medication you have taken for years, or changing to a drug that needs monitoring. A second view is cheap insurance.
There is a fifth reason people rarely say out loud: the relationship with the first clinician has broken down. That is legitimate too.
What a second opinion can settle
A second opinion is a full, independent assessment. Done properly, it can:
- take a longer, more systematic history than a short review allows
- test the diagnosis against the criteria, including childhood history where that matters
- look for conditions alongside the first that change what treatment should be
- review the whole medication history — what was tried, at what dose, and what happened
- say whether the current plan is reasonable, and write the reasoning down
That written reasoning is often the most valuable part. A diagnosis you can read the argument for is very different from one you were handed.
What it cannot settle
Being clear about this saves disappointment.
It cannot guarantee a different answer. Quite often it confirms the first, which is not a wasted appointment — knowing a diagnosis has been independently checked frees you to get on with treating it. But if you are paying in hope of a particular label, you may not get it.
It cannot overrule the first clinician, or compel anyone to prescribe. Two doctors can disagree, and neither outranks the other. The NHS is explicit that your GP is not obliged to accept a specialist’s recommendations, private or otherwise.
And it cannot fix what is not diagnostic. If what keeps you unwell is a job grinding you down, or isolation, or unaddressed trauma, a better label will not change that. Sometimes the honest outcome is that the answer is therapy rather than a different tablet.
Getting one on the NHS
One important nuance: you do not have a legal right to a second opinion in the NHS. Mind puts it plainly: “You’re allowed to ask for a second opinion from another doctor… But you don’t have a legal right to a second opinion. So your doctor can say no.” Their page on what to do if your GP does not help sets out the other options.
Requests are often granted. A few things help:
- Ask the clinician directly, in writing if a conversation feels hard, and say what specifically does not fit.
- Be concrete. “Three antidepressants for eight months each with no real change, and I would like the diagnosis reviewed” lands differently from “I want a second opinion”.
- Ask your GP if the specialist declines. They can make a fresh referral, sometimes to a different service.
- Contact PALS — the trust’s Patient Advice and Liaison Service — if you get nowhere. They exist to unstick exactly this.
- Consider your right to choose. In England, the GOV.UK NHS Choice Framework says that where you are referred to a mental health professional you can decide which provider you would like to receive care from as an outpatient. That applies at the point of referral — not to onward referrals within a service already treating you, nor to urgent or crisis care.
The trade-off is time: the waiting list for a second opinion is the same list as for a first. If you are already waiting, see what to do meanwhile.
Getting one privately
Paying privately is faster and you choose the clinician. You do not need a GP referral, although the NHS still advises getting a referral letter if you can, and most insurers require one.
Privately, a second opinion is an initial psychiatric assessment asking whether the existing diagnosis and plan are right. At Happy Clinic that is a 60 minutes video consultation with a consultant psychiatrist, £400, with 20 minutes follow-ups at £200. Diagnostic clarification is one of the things the service is set up for. Fees checked September 2026 — see the fees page for the current list. Consultations are provided by Happy Clinic, which is registered with the Care Quality Commission (CQC).
Before booking anywhere, check that you will see a consultant psychiatrist on the GMC’s specialist register, how long the appointment is, and whether a written report is included. A second opinion without a report is worth much less, because the report is what you take back to your GP.
One caveat: if your question is whether you should be on a particular controlled medication, be prepared for a different view. Paying buys no conclusion.
What to bring
A second opinion is only as good as the information it works from, and you hold most of that. Bring:
- Your medication history — every psychiatric medicine, the dose, when and for how long, why it stopped and what it did. The most useful document you can bring.
- Copies of letters and reports from previous clinicians, including the one that gave the diagnosis you question.
- A printout of your GP record summary, which you can ask your surgery for.
- What you want answered, in a sentence or two.
- Childhood information if ADHD or autism is part of the question. School reports and a parent’s or older sibling’s recollections carry real weight.
- Physical health results — blood tests, blood pressure, ECGs.
Also useful: a note on what has actually changed in your life while treated. Clinicians ask about symptoms; what settles a diagnostic question is often function.
What usually happens afterwards
Roughly three outcomes. The original diagnosis is confirmed: the second clinician agrees, possibly refines it, and may suggest a different treatment within the same diagnosis — a medicine not yet tried, a dose never pushed high enough, or therapy alongside medication.
The diagnosis is changed or added to. Most often something is added rather than replaced: the depression is real, and there is undiagnosed ADHD underneath. That changes the treatment order, and a medication review is often the next step.
The picture is still unclear, and the recommendation is to gather more — collateral history from a family member, monitoring over time, blood tests, or a structured autism assessment.
Whichever it is, ask for the reasoning in writing and for it to go to your GP with your consent. A second opinion that never reaches your record gets re-argued with every new clinician.
If you are considering a fresh assessment, see the conditions page, read about online psychiatry or book a consultation.
Speak to a Consultant Psychiatrist
Book a secure video consultation with Happy Clinic. No GP referral needed, with appointments usually available within days.
This article is general information and is not a substitute for personal medical advice. If you are in crisis, call 999, go to A&E, call NHS 111 or call Samaritans free on 116 123.