1. Frequent urination
When blood sugar levels are high, the kidneys try to remove the excess sugar by filtering it out of the blood.
This can lead to a person needing to urinate more frequently, particularly at night.
2. Increased thirst
The frequent urination that is necessary to remove excess sugar from the blood can result in the body losing additional water.
Over time, this can cause dehydration and lead to a person feeling more thirsty than usual.