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Hypoglycaemia (Low Blood Sugar Level)

Hypoglycaemia occurs when your blood sugar level drops too low (usually below 4.0 mmol/l). This can only happen if you are taking insulin or certain tablets for your diabetes.

Warning Signs

You may feel one or more of the following things. These usually appear quickly.

  • Shaking
  • Dizziness
  • Hunger
  • Fast heart beat
  • Tingling around the mouth and lips
  • Feeling tired or weak
  • Headache

If not treated or the blood sugar level goes lower, you may develop:

  • Confusion
  • Behaviour as if drunk
  • Slurred speech
  • Drowsiness which may lead to becoming unconscious

Common Causes

  • Skipping or delaying meals and snacks
  • Not eating enough carbohydrate (starchy) food
  • Too much insulin or tablets
  • Drinking alcohol without food
  • Extra physical activity without eating extra food

What to do

Have some sugar quickly such as:

  • 5 - 7 jelly beans
  • 1 glass of soft drink (not diet)
  • 1 glass of fruit juice
  • 2-4 teaspoons of sugar or honey

If you don’t feel better in 5-10 minutes have some more sugar.

Then eat some carbohydrate (starchy) food such as:

  • 1 piece of fruit
  • 1 glass milk
  • 1 sandwich
  • 2-4 dry biscuits
    or
  • If it is time for your meal, have it immediately.

What to do if a person becomes unconscious: (This situation is not very common)

  • Never give any food or fluids by mouth
  • Turn the person on their side
  • Call an ambulance

An injection to raise the blood sugar level called ‘Glucagon’ can be given by a family member at home. Speak to your doctor if you think this is necessary.

How to prevent Hypoglycaemia (Low blood sugar level)

  • Eat your meals on time and don’t skip meals
  • Make sure you eat enough carbohydrate (starchy) food at each meal
  • If drinking alcohol, have it with a carbohydrate (starchy) snack e.g. pretzels, dry biscuits or bread
  • Eat extra carbohydrate (starchy) food if planning extra physical activity.

Speak to your doctor or diabetes nurse if:

You cannot work out why your blood sugar level is dropping too low. The dosage of your insulin or tablets may need to be reduced.

Remember:

Always carry some form of sugar e.g. jelly beans

Talk to your family and friends about low blood sugar levels so they know how to help you

Carry an identification card, bracelet or necklace stating you have diabetes in case of emergency

 

Diabetes & You The essential guide 1999

 

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