It's normal for the Nintendo Switch to feel warm during handheld mode, especially when playing more demanding games. Both the console and the Joy-Con controllers can generate some heat during extended use, but this is generally not a cause for concern.
Here are a few things you can consider:
1. **Ventilation:** Make sure your Switch is in a well-ventilated area and not covered by any blankets or cushions that could restrict airflow.
2.