5. Blurred Vision
In the short term, blurred vision can occur as a result of changes in the fluid levels in your body. This can cause the lenses in your eyes to literally swell up, creating a blurry vision, and making it hard for you to focus on things in the world around you.
Later on, your vision might also start to become damaged by the high blood sugar damaging nerves around the eyes. If this is allowed to continue, it can eventually lead to complete vision loss. This is one more reason it is so important to find out early on if you are suffering from diabetes and to get medical assistance if so.