When a glucometer displays ?low,? it usually means your blood sugar has fallen below a safe level. This can happen if you skip meals, eat very little, take diabetes medicine at the wrong time, exercise heavily without enough food, or have a long gap between meals. Low sugar may cause sweating, shaking, weakness, hunger, dizziness, blurred vision, fast heartbeat, or sudden confusion. If this happens, try to take a quick source of sugar immediately, such as glucose powder in water, fruit juice, regular soft drink, sugar candy, or glucose tablets if you are fully awake and able to swallow safely. After a short time, eating a proper meal or snack may help keep the sugar from dropping again. Frequent low sugar episodes should not be ignored because they may become risky, especially in older adults or people with heart disease. Keeping regular meal timings, monitoring sugar levels properly, and avoiding long fasting periods may help prevent sudden drops. Immediate medical attention may be needed if you become unconscious, develop seizures, have severe confusion, or are unable to eat or drink safely during an episode.