Hi type 1 diabetic here, yeah the other person pretty much said it all, but yeah blood sugar go can both hypo and hyper as diabetics basically have no means for regulating blood sugar. For me my blood sugar tends to run high either cus of my anxiety of going low or miscounting carbs (thank god for my sensor that automatically gives insulin). However if I’m feeling stressed or I’m working for 3 hours without a snack my blood sugar drops

Bonus fact: insulin acts like a key for the glucose in the blood to get to cells, so without insulin glucose accumulates in the blood, but it also helps your blood sugar from going low. Treatment should happen at 80, low is considered 60 or 70 and below, while high starts at 180 to 200. At around 500 or 600 most meters will stop reading specific numbers and just want you to get insulin in your body