Smartphones overheat during gaming because intensive tasks like 3D rendering, high frame rates, and constant internet connectivity push the CPU and GPU to operate at maximum performance. This increases power consumption, which generates heat. If the heat is not managed properly, the device may throttle performance to prevent internal damage.
Manufacturers reduce overheating by using cooling solutions such as vapor chambers, graphite layers, copper heat pipes, and optimized thermal software management. Some phones also lower brightness or frame rates automatically when temperatures rise. Efficient chip design (like smaller nanometer fabrication processes) also helps reduce heat output while maintaining performance.