What are the symptoms of prediabetes?

Not much. Unlike type 2 diabetes, pre-diabetics might not have any physical signs/symptoms. It's important to get your lab tested if you think you have prediabetes. Some of the signs/symptoms of hyperglycemia are: unusual thirst, frequent urination, blurry vision, fatigue or feeling more tired than normal for unknown reasons, unusual weight loss, hunger, frequent infections, cuts/bruises that won't heal...
None. Definition is fasting sugar 100-125, , sugar 2-4 hors after eating 140-199, hga1c 5.7-6.4 though elevated and actually these levels start damage to tissues in body, they are not high enough to cause any symptoms must be diagnosed by blood testing only.