These depend on how much a person’s blood sugar is elevated. Some people, especially those with type 2 or prediabetes, may not initially experience symptoms. Symptoms in type 1 diabetes tend to be more severe and occur more quickly. Symptoms of type 1 and type 2 diabetes can include frequent urination, increased thirst, unexplained weight loss, extreme hunger, fatigue, ketones in the urine (a byproduct of the breakdown of muscle and fat that occurs when insulin is lacking), irritability, slow-healing sores, blurred vision, or frequent infections (gums, skin or vagina). Type 1 diabetes can develop at any age, but it typically appears during childhood or adolescence. Type 2 diabetes can also develop at any age, though it is more common after the age of 40.