Hypoglycemia, also called low blood glucose or low blood sugar, occurs when the level of glucose in your blood drops below normal.
Your body needs glucose to have enough energy for your body and brain and comes from what we eat and drink. After you eat, your blood absorbs glucose. If you eat more sugar than your body needs, your muscles, and liver store the extra. When your blood sugar begins to fall, a hormone (insulin) tells your liver to release glucose. In most people, this raises blood sugar. If it doesn't, you have hypoglycemia, and your blood sugar can be become low and you may not feel well and experience psychological consequences such as depression and anxiety attacks.