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uk Health & medical scares low blood sugar • hypoglycaemia • hypo episode • blood glucose low • blood sugar dropping • keeps falling after eating • low reading despite carbs • won't come up • recurrent hypos • sudden shaky sweaty • confused or drowsy • cgm low alert • finger prick confirms low • insulin related low • sulfonylurea low blood sugar • night time hypo • after exercise hypo • alcohol related hypo • low glucose emergency • unexplained low blood sugar

What to do if…
your blood sugar reading is low and keeps dropping despite eating

Short answer

Treat this as urgent: take fast-acting sugar now, re-check in 10–15 minutes, and repeat. If it’s still low, still falling, or you’re getting worse, call 999 for an ambulance (or ask someone to call for you).

Do not do these things

  • Do not drive, cycle, or operate anything risky.
  • Do not “wait it out” if the number keeps falling or symptoms are worsening.
  • Do not go to sleep.
  • Do not take more insulin (or other glucose-lowering medicine) “to balance it.”
  • Do not start with slow foods (chocolate, biscuits, milk, high-fat/protein snacks) — they can act too slowly.
  • Do not drink alcohol.
  • Do not force food or drink if you’re very drowsy, choking, or might pass out.

What to do now

  1. Get to a safer pause and get help nearby. Sit or lie down. If you’re alone, call someone to come to you now and keep your phone unlocked. If you feel faint/confused, get onto the floor to reduce fall risk.
  2. Confirm the reading quickly (especially if you use a CGM). If your CGM shows a fast drop, do a finger-prick check if you can (CGM can lag). In the UK, below 4.0 mmol/L is commonly treated as low — treat immediately if you’re below this or you feel low.
  3. Take fast-acting sugar (straight glucose) now. Choose one option you can swallow safely:
    • Glucose/dextrose tablets, or glucose gel, or
    • A small glass of fruit juice, or regular (non-diet) fizzy drink, or
    • A measured portion of sugary sweets. A typical adult treatment amount is about 15–20g of fast-acting carbohydrate.
  4. Re-check in 10–15 minutes. If still under 4.0 mmol/L or still dropping, treat again. Repeat the same fast-acting sugar dose and re-check again after 10–15 minutes.
  5. If it’s not responding, escalate early. Call 999 if any of these apply:
    • You’re still below 4.0 mmol/L after repeating fast sugar (for example, after 2–3 treatment cycles), or it keeps dropping.
    • You’re becoming confused, very drowsy, unable to swallow safely, or you’ve had a seizure/blackout.
    • You cannot keep sugar down (vomiting/retching), or you’re alone and symptoms are progressing. While waiting: unlock the door if you can, lie on your side if very drowsy, and keep re-checking if you’re able.
  6. If you become too drowsy to swallow or you pass out (or this is happening to someone else):
    • Do not give food or drink by mouth.
    • Put them in the recovery position.
    • If a glucagon kit/pen is available and someone knows how to use it, they can give it and call 999.
  7. Once you’re improving, prevent the next drop. When you’re clearly better and can eat safely, have a longer-acting carbohydrate (for example: toast, a sandwich, cereal, crackers, or your next meal), especially if your next meal is not soon.
  8. After you’re stable, get same-day advice if this was “hard to treat.”
    • If you take insulin or a sulfonylurea (some type 2 diabetes tablets), or your levels keep dipping again, contact your diabetes team/GP urgently.
    • If you’re not on glucose-lowering medicines and you’re getting confirmed low readings, seek same-day urgent assessment (use NHS 111 if you’re unsure where to go). Call 999 for severe symptoms.

What can wait

  • You do not need to work out the exact cause right now.
  • You do not need to change insulin doses, pump settings, or other diabetes medicines while you’re actively low and dropping.
  • You do not need to eat a full meal first; quick sugar and re-checking comes first.
  • You do not need perfect notes — a simple list of times, readings, and what you took is enough.

Important reassurance

A dropping low can cause fear, shaking, and confusion because your brain is running short on glucose. Needing repeated quick sugar (and calling for help when it’s not responding) is a safety issue, not a personal failure.

Scope note

These are first steps for the next minutes to hour to reduce immediate harm. Recurrent or “hard to treat” lows need follow-up, but that comes after you’re safe.

Important note

This guide is general information, not a diagnosis or personal medical advice. If your reading won’t rise despite repeated fast sugar, you can’t swallow safely, or you have severe symptoms, seek emergency help immediately.

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