Diabetes symptoms vary depending on how much your blood sugar is elevated. Some people, especially those with prediabetes or type 2 diabetes, may not experience symptoms initially. Some of the signs and symptoms of type 1 and type 2 diabetes are: Increased thirst Frequent urination Extreme hunger Unexplained weight loss Presence of ketones in the urine (ketones are a byproduct of the breakdown of muscle and fat that happens when there's not enough available insulin)Fatigue Irritability Blurred vision Slow-healing sores Frequent infections, such as gums or skin infections