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What to do if…
you develop a rapidly enlarging swelling in your neck that makes swallowing uncomfortable

Short answer

Treat this as urgent. If the swelling is growing quickly or swallowing is getting harder, call 999 now—especially if your throat feels tight, your voice changes, or breathing feels affected.

Do not do these things

  • Do not “wait it out” if it’s enlarging over minutes/hours or your swallowing is worsening.
  • Do not eat or drink “to test it” if swallowing is uncomfortable or deteriorating (choking risk).
  • Do not stand and pace around if you feel faint or unwell—sit or lie down.
  • Do not take a new medicine/supplement to “see if it helps” (it can worsen an allergic reaction in some people).
  • Do not drive yourself to A&E if you feel faint, short of breath, or the swelling is progressing quickly.

What to do now

  1. Check for airway warning signs (right now). Call 999 if any are present:
    • you’re struggling to swallow, especially your own saliva, drooling, or “can’t get it down”
    • your throat feels tight, your voice becomes hoarse/muffled, or you can’t speak clearly
    • breathing is fast/noisy, you’re wheezing, gasping, or feel like you’re choking
    • you feel suddenly dizzy, very weak, confused, drowsy, or you collapse
  2. If you have a prescribed adrenaline auto-injector (EpiPen/Jext/Emerade) and this could be a severe allergic reaction:
    • Use it immediately.
    • Call 999 straight after and say “anaphylaxis/angioedema,” even if you start to feel better.
    • If you are alone, use the injector first, then call 999.
  3. Position yourself safely while help is on the way:
    • If you feel faint or very unwell, lie flat (and raise your legs if you can).
    • If breathing is difficult, sit upright to make breathing easier.
    • Avoid standing or walking around.
  4. If you’re not in immediate danger but it’s enlarging quickly or swallowing is uncomfortable/worsening:
    • Get urgent medical help today.
    • Call 111 for urgent advice (England/Scotland/Wales). If you’re in Northern Ireland, use your GP out-of-hours/urgent care phone service for advice on where to be seen today.
    • If you’re told to go to A&E, go. If symptoms worsen while you’re deciding, switch to 999.
  5. Gather key information for clinicians (30 seconds):
    • note the time it started and how fast it’s growing (take a quick photo now; another later only if safe)
    • list new medicines in the last few weeks (especially blood pressure tablets), recent stings/foods, and any known allergies
    • bring your medicines (or a photo of labels)
  6. If you might pass out or you’re alone:
    • unlock your door, keep your phone charged/nearby, and message/call someone to check in until you’re seen.

What can wait

  • You do not need to figure out the cause (allergy vs infection vs something else) right now.
  • You do not need to book routine GP tests today if it’s rapidly enlarging—this needs urgent triage first.
  • You do not need to decide about referrals/specialists now—first priority is safe assessment and airway risk.

Important reassurance

It’s understandable to feel alarmed—neck swelling that changes quickly can feel threatening. Getting urgent assessment is the safest move, and it’s exactly what urgent and emergency services are for.

Scope note

This is first-step guidance only, aimed at keeping you safe and getting you to the right urgent service. Further tests and treatment depend on what clinicians find.

Important note

This guide is general information, not a diagnosis or a substitute for a clinician’s assessment. If swallowing or breathing is affected, or the swelling is rapidly increasing, treat it as an emergency.

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