If blood sugar levels become too low, hypoglycemia signs and symptoms can include:  Looking pale Shakiness Sweating Headache Hunger or nausea An irregular or fast heartbeat Fatigue Irritability or anxiety Difficulty concentrating Dizziness or lightheadedness Tingling or numbness of the lips, tongue or cheek  As hypoglycemia worsens, signs and symptoms can include:  Confusion, unusual behavior or both, such as the inability to complete routine tasks Loss of coordination Slurred speech Blurry vision or tunnel vision Nightmares, if asleep  Severe hypoglycemia may cause:  Unresponsiveness (loss of consciousness) Seizures 
blood sugar levels low  hypoglycemia signs symptoms can include:  looking pale shakiness sweating headache hunger nausea irregular fast heartbeat fatigue irritability anxiety difficulty concentrating dizziness lightheadedness tingling numbness lips  tongue cheek  hypoglycemia worsens  signs symptoms can include:  confusion  unusual behavior both  inability complete routine tasks loss coordination slurred speech blurry vision tunnel vision nightmares  asleep  severe hypoglycemia may cause:  unresponsiveness (loss consciousness) seizures 
hypoglycemia