Diabetes is a disease that affects the body’s ability to process sugars in food. Someone with diabetes can suddenly become ill if s/he has too much, or too little, sugar in his/her blood. Diabetes is more common in people who are overweight, but anyone can get diabetes. If you know someone is having a problem due to diabetes but you are not sure if the problem is from low blood sugar or high blood sugar, treat as if s/he has low blood sugar, and then take him to get medical help.
A person’s blood sugar can drop too low if s/he is taking insulin or another diabetes medication and if s/he takes too much medicine, does not eat enough food, does too much physical activity, waits too long between meals, or drinks alcohol.
Someone with low blood sugar may become clumsy, confused, nervous or irritable. S/he may sweat or tremble. When that happens, s/he must eat. Low blood sugar can look a lot like the person is drunk and can be overlooked as being a real emergency. If s/he does not, his/her condition will worsen and will develop these danger signs:
If s/he is conscious, quickly give him/her sugar: fruit juice, soda, candy, or a glass of water with several spoons of sugar in it will all work. S/he should eat a full meal soon after as well. If s/he is still confused or does not begin to feel better 15 minutes after you have given sugar, get help.
If s/he is unconscious, place a pinch of sugar or honey under his/her tongue. Keep giving small amounts. It takes time for the body to absorb sugar. When s/he wakes up you can give him/her more.
A person with diabetes can have too much sugar in his/her blood if s/he eats too much food, is less active than usual, has a serious illness or infection, does not take his diabetes medicine, or gets dehydrated. This can happen to a person even if s/he does not yet know s/he has diabetes. Get help for these signs:
If not treated, high blood sugar can be very dangerous and can lead to a coma or even death.
You can save a person’s life by getting help for these more dangerous signs:
Take him/her immediately to a medical centre. If s/he is conscious, give him/her plenty of water to drink. Give a little at a time.
If you are certain s/he has high blood sugar and know his/her insulin dose, give a small amount of insulin on the way to help. But if you are not certain, do not give insulin. Giving someone insulin when they have low blood sugar can kill them.
Source : Where there is no doctor