Low Blood Sugar Symptoms and the 15-15 Rule
Low blood sugar can hit fast.
One minute you feel fine. The next, your hands are shaking and your thoughts feel foggy.
Here is how to spot it, and exactly what to do about it.
What Counts as “Low”?
The American Diabetes Association defines low blood sugar as a reading below 70.
Below 54 is considered severe. That level needs faster action.
Early Signs of Low Blood Sugar
- Shakiness
- Sweating
- Fast heartbeat
- Sudden hunger
- Feeling anxious or irritable
- Dizziness
These often show up first. Catching them early makes treatment easier.
Signs of More Severe Low Blood Sugar
- Confusion or trouble concentrating
- Blurry vision
- Slurred speech
- Weakness or trouble walking
The 15-15 Rule: How to Treat It
The American Diabetes Association recommends a simple rule. It works for mild to moderate low blood sugar.
- Eat or drink 15 grams of fast-acting carbs. See the table below for options.
- Wait 15 minutes. Then check your blood sugar again.
- Still under 70? Repeat the 15 grams, and check again in 15 minutes.
- Once it is 70 or above, eat a small snack with protein if your next meal is more than an hour away.
Good 15-Gram Options
| Option | Amount |
|---|---|
| Glucose tablets | Follow package directions, usually 3 to 4 tablets |
| Glucose gel | 1 tube |
| Juice | 1/2 cup, about 4 ounces |
| Regular soda, not diet | 1/2 cup, about 4 ounces |
| Honey or sugar | 1 tablespoon |
What Causes Low Blood Sugar?
- Too much diabetes medicine or insulin for the food eaten
- Skipping or delaying a meal
- More exercise than usual, without enough food
- Drinking alcohol, especially without food
Keep a Kit Ready
Keep fast-acting carbs within reach. Your bag, car, nightstand, and desk are all good spots.
If your doctor has prescribed glucagon, keep it nearby too, along with clear instructions for anyone who might need to use it.
What to Do This Week
- Pack a small stash of glucose tablets or juice boxes in your bag or car.
- Tell a close friend or family member the signs to watch for.
- Ask your doctor if you need a glucagon kit at home.
- Review the 15-15 rule until it feels automatic.
The Bottom Line
Low blood sugar can move fast, but the fix is simple. Fifteen grams of fast carbs, wait 15 minutes, recheck.
Know the signs of severe low blood sugar. Seizures or passing out mean it is time for emergency help.
Want a simpler way to understand type 2 diabetes or prediabetes? Join Type 2 Made Simple and get the free Type 2 Clarity Kit, a plain-English starter kit to help you understand your numbers, make easier food choices, and feel more prepared for doctor visits.
Frequently Asked Questions
What blood sugar level counts as low?
The ADA defines low blood sugar as below 70. Below 54 is considered severe.
What is the 15-15 rule?
Eat 15 grams of fast-acting carbs, wait 15 minutes, then recheck. Repeat if still low.
Why should I avoid chocolate for treating low blood sugar?
Fat slows down how fast sugar reaches your blood. You want something fast-acting instead, like juice or glucose tablets.
When does low blood sugar become an emergency?
A seizure or loss of consciousness means it is a medical emergency. Call for help right away.
What causes low blood sugar most often?
Too much medicine for the food eaten, skipped meals, extra exercise, and alcohol are common causes.
This article is for general education only and is not medical advice. Always talk with your healthcare provider or a registered dietitian before making major changes to your diet, medication, or diabetes care plan.
