Some of the common symptoms of high blood sugar include being thirsty, urinating a lot, feeling week or tired, having a blurred vision or sudden loss of weight. Later symptoms can cause tingling, numbness, or pain in the hands or feet.

High blood sugar, or hyperglycemia, is most commonly caused by diabetes, where the body either doesn’t produce enough insulin or can’t use it effectively. Other causes include eating too many sugary or processed foods, lack of physical activity, stress, illness, certain medications (like steroids), hormonal changes, skipping meals, and dehydration. These factors can raise blood glucose levels by interfering with insulin function or increasing glucose production in the body.