Your sugar level was one time high but later when ichecked it is nil why do you have any complaint?

Answer 1

Blood sugar changes over time as a natural part of your body's digestion and energy control. It can easily go between low and high and back again within a single day, if you have a functioning pancreas.

But if you are diabetic, blood sugar can easily go high (because you ate some carbohydrates), and then be unable to go low again within the usual 2 hours (because your pancreas isn't working at full capacity.)

If your sugar level was abnormally high, but then later was in normal ranges, your pancreas was able to reduce the level. This is good, but it depends how long it took. If you take longer than 2 hours after eating to reduce that blood sugar, your pancreas may be struggling, which means you're on your way to Diabetes. The doctor can do a 'glucose tolerance test' (where he feeds you sugar then tests blood sugar every half hour) to see how efficient your pancreas is.