Symptoms of type 1 diabetes usually come on quickly within days or weeks. The following can be signs of type 1 diabetes:
* Your appetite has increased, and you're still losing weight.
* You're fatigued or irritable.
* Your vision is blurry.
* You're dehydrated.
Once diagnosed, you will still experience high and low blood sugar levels. High blood sugar levels develop slowly. Low blood sugar levels can develop in minutes. Symptoms of low blood sugar include sweating, weakness and hunger. Symptoms of high blood sugar include increased thirst and urination.