Do you only have the symptoms of diabetes (peeing often, drinking often etc.) if you have high blood sugar?

Not always. New onset diabetes can present with the classic symptoms of increased thirst, urination and weight loss despite increased appetite, although this does not always happen, especially in new type 2 diabetics. The blood sugar value is usually significantly high to see these symptoms, but the actual value varies by individual, some patients might exhibit symptoms at a lower value than others.