The signs of low blood sugar, or hypoglycemia, can vary depending on how low the blood sugar level drops and how quickly it drops. Here are some common signs and symptoms:

1. Shakiness or Trembling: Feeling shaky, jittery, or having trembling hands is a common sign of low blood sugar.

2. Sweating: Experiencing sudden sweating, especially when it's not hot or you're not exerting yourself, can be a sign of hypoglycemia.

3. Dizziness or Lightheadedness: Feeling dizzy or lightheaded, as if you might faint, can occur during episodes of low blood sugar.

4. Weakness or Fatigue: Feeling unusually weak or fatigued, even if you haven't done much physical activity, can be a sign of low blood sugar.

5. Hunger: Sudden and intense hunger, often accompanied by cravings for sweets or carbohydrates, can indicate hypoglycemia.

6. Headache: Some people experience headaches or migraines when their blood sugar drops too low.

7. Irritability or Mood Changes: Low blood sugar can lead to irritability, mood swings, anxiety, or even confusion.

8. Blurred Vision: Vision changes, such as blurred vision or difficulty focusing, can occur during episodes of hypoglycemia.

9. Rapid Heartbeat: Your heart may beat faster than usual during a hypoglycemic episode.

10. Nausea or Vomiting: Some people may feel nauseous or even vomit when their blood sugar drops too low.

It's important to note that severe hypoglycemia can lead to seizures, loss of consciousness, and other serious complications. If you or someone you know is experiencing severe symptoms of hypoglycemia, seek medical help immediately.