1. Eyesight Deterioration
You might push this one aside and write it off to you getting older but this is a serious symptom of diabetes. Ignoring this can lead to permanent blindness. Diabetes can cause blurry vision in the beginning but can get more serious over time.
The lens of your eye wraps and struggles to focus on a point as your body dehydrates. But with proper management, the sight issue can be resolved in most cases.