Diabetes symptoms depend on how high your blood sugar is. Some people, especially if they have prediabetes, gestational diabetes or type 2 diabetes, may not have symptoms. In type 1 diabetes, symptoms tend to come on quickly and be more severe. prediabetes gestational diabetes type 2 diabetes type 1 diabetes Some of the symptoms of type 1 diabetes and type 2 diabetes are: 
Feeling more thirsty than usual.
Urinating often.
Losing weight without trying.
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.
Feeling tired and weak.
Feeling irritable or having other mood changes.
Having blurry vision.
Having slow-healing sores.
Getting a lot of infections, such as gum, skin and vaginal infections.
 Type 1 diabetes can start at any age. But it often starts during childhood or teen years. Type 2 diabetes, the more common type, can develop at any age. Type 2 diabetes is more common in people older than 40. But type 2 diabetes in children is increasing.