Symptoms of hypoglycemia include:

• Shakiness or trembling
• Sweating
• Hunger or upset stomach
• Fast or irregular heartbeat
• Dizziness or lightheadedness
• Irritability, anxiety, or nervousness
• Headache
• Difficulty concentrating
• Fatigue or weakness
• Pale skin color
• Tingling or numbness in lips, tongue, or cheek
• Confusion or unusual behavior
• Clumsiness or loss of coordination
• Slurred speech or trouble speaking
• Blurred or tunnel vision
• Nightmares or restless sleep (if it occurs at night)
• Seizures or loss of consciousness in severe cases

Symptoms can vary from person to person and may develop quickly. Some people may not have obvious symptoms, so regular blood sugar monitoring is important.