Low blood sugar, or hypoglycemia, typically feels like a combination of physical and mental symptoms caused by the body not having enough glucose for energy. Common early signs include:

• Feeling hungry
• Trembling or shakiness
• Sweating
• Feeling anxious or irritable
• Dizziness or lightheadedness
• Tingling lips
• Fast or pounding heartbeat
• Feeling weak or tired
• Difficulty concentrating or confusion
• Blurred vision

As blood sugar drops further, symptoms can worsen to include slurred speech, poor coordination, unusual behavior, and in severe cases, seizures, loss of consciousness, or coma

. Some people may experience hypoglycemia during sleep, leading to night sweats, nightmares, restless sleep, and feeling tired or confused upon waking

. These symptoms arise because low blood sugar triggers the release of adrenaline (epinephrine), which causes many of the physical signs such as shaking, sweating, and a rapid heartbeat

. People with diabetes who take insulin or certain medications are most at risk, but hypoglycemia can also occur in others due to factors like malnutrition or excessive alcohol intake

. In summary, low blood sugar feels like a sudden onset of hunger, shakiness, sweating, anxiety, weakness, and cognitive difficulties that can escalate if not treated promptly.