Can Low Blood Sugar Cause Headaches? Low blood sugar can cause headaches and other symptoms to occur suddenly. Glucose that falls below 70 mg/dL counts as hypoglycemia. Hypoglycemia may occur as a result of medications used to treat type 2 diabetes. Proper medication management, eating a healthy diet regularly and maintaining a consistent amount of physical activity are the best ways to prevent low blood sugar. Low blood sugar is medically known as hypoglycemia. When blood sugar levels drop too low, it can cause many different symptoms, including headaches. In this article, you’ll learn about the diagnosis, treatment, and prevention of headaches relating to low blood sugar, as well as how to know when you should see a healthcare provider. Can Low Blood Sugar (Hypoglycemia) Cause Headaches? Hypoglycemia occurs when blood sugar levels fall below 70 mg/dL. They are often caused by imbalances in medications used to treat type 2 diabetes. Because the brain relies on glucose as fuel, low blood sugar can quickly become a serious condition that needs urgent medical attention. Low blood sugar can cause headaches and other symptoms. If you have type 2 diabetes and develop a headache, checking your glucose levels can identify whether low or high levels contribute to the headache. If you take medication for type 2 diabetes and change your typical carbohydrate intake, and activity level, or don’t take your medication consistently, it can affect blood sugar levels. Low blood sugar is not uncommon. Around half of those who take medication for type 2 diabetes may experience low blood sugar at some point. Chat with a medical provider using K Health. What Do Headaches from Low Blood Sugar Feel Like? Headaches that are caused by low blood sugar happen because of changes to brain hormones like epinephrine and norepinephrine. These changes impact blood vessel dilation, which can increase blood flow mechanisms , resulting in dull or all-over head pain.