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uk Health & medical scares new swelling both legs • swollen ankles and feet • leg oedema suddenly worse • breathless at night • waking up short of breath • worse when lying down • needing extra pillows to breathe • fluid retention symptoms • rapid weight gain with swelling • puffiness in legs and ankles • tight shiny skin on legs • shortness of breath at rest • nighttime breathing trouble • legs swelling no injury • both legs swollen and breathless • swelling with fatigue • possible heart strain symptoms • breathlessness lying flat • swollen legs and wheezy cough

What to do if…
you notice new swelling in both legs along with worsening breathlessness at night

Short answer

Treat this as urgent. If you’re more breathless when lying down or waking up at night short of breath, get urgent NHS help now (111), and call 999 if breathing is severe or you have chest pain/fainting/confusion.

Do not do these things

  • Do not “sleep it off” if breathlessness is worsening at night or when lying down.
  • Do not drive yourself to A&E if you feel very breathless, faint, confused, or have chest pain — call 999 instead.
  • Do not take extra “water tablets” (diuretics) or other prescription medicines unless you have a written plan from a clinician for exactly this situation.
  • Do not drastically restrict fluids or take over-the-counter “water loss” products.
  • Do not keep repeatedly lying flat “to test it” if that makes breathing worse.

What to do now

  1. Call 999 (or go to A&E) immediately if any emergency signs apply:
    • severe difficulty breathing (gasping/choking or unable to get words out)
    • chest tightness/heaviness or chest pain, especially if it spreads
    • blue/grey lips/skin, new confusion, or fainting/collapsing
    • coughing up blood, especially with breathlessness or chest pain
  2. If it’s not 999-level but clearly new/worsening: contact NHS 111 now.
    • Use 111 online if you can, or call 111 if online isn’t suitable for you (for example, you need interpretation/help over the phone, or you’re not within the online service’s age coverage).
    • Say clearly: “New swelling in both legs” and “Breathlessness worse when lying down / waking up at night short of breath.”
  3. Sit upright while you arrange help.
    • Sit supported upright (or propped up with pillows). Keep talking and movement minimal.
  4. Prepare a 2-minute “info pack” for 111/clinicians.
    • Your medications (or photos of the boxes), allergies, and any heart/lung/kidney/liver problems.
    • When the swelling started, whether it’s getting worse daily, and whether shoes/socks suddenly feel tight.
    • If you can without exertion: today’s weight (and any rapid change), and your heart rate.
  5. Watch for clot / lung “red flags” and state them clearly if present.
    • DVT symptoms are usually in one leg. If one leg is much more swollen/painful/red/hot than the other, tell 111/999.
    • If you have chest pain, fainting, severe breathlessness, or cough up blood, treat as emergency and use 999/A&E.
  6. If you already have a heart failure nurse/team or a written action plan:
    • Follow your plan for contacting them, but do not wait if breathlessness is worsening at night or you can’t reach the team quickly — use 111/999.

What can wait

  • You do not need to work out the exact cause tonight.
  • You do not need to start strict fluid restriction, new diets, or supplements right now.
  • You do not need to decide about long-term treatment changes until you’ve been assessed.
  • You can wait to sort work/family logistics until you’ve spoken to 111 or been evaluated.

Important reassurance

This pattern (new leg swelling plus breathlessness that’s worse lying down or waking you at night) is a well-recognised reason to seek urgent assessment. Many causes are treatable, and getting checked early reduces the chance of sudden worsening.

Scope note

These are first steps to keep you safe and get you to the right urgent service. Diagnosis and treatment decisions need a clinician who can examine you and arrange tests if needed.

Important note

This is general information, not a diagnosis. If symptoms are severe, rapidly worsening, or you’re unsure, choose the safer option: call 999 or contact NHS 111 now.

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