Severe hypoglycaemia requires the help of others to reverse it.
You may not notice the warning signs, and it may come on rather suddenly.
If you have a severe low blood glucose reaction and can't treat yourself, someone needs to give you an injection of glucagon. So you need to make sure your family and friends are prepared and know what to do.
An injection will be necessary if they can't give you a quick source of sugar. If you are unconscious, they must not attempt to give you anything by mouth because of the risk of choking.