Why does my iPhone get hot while using?

The iPhone is heating up while using it because of the performance-heavy tasks of gaming, streaming, heavy multitasking, etc. All these things demand much of the processor, and hence it generates heat. Even environmental parameters like direct sunlight or charging the phone while working can contribute to its heating.
 
Your iPhone gets hot when using it because of heavy apps or processes that demand high processing power, like gaming, streaming, or using GPS. This causes the CPU to work harder, generating heat. Other factors include poor ventilation (using it while charging, for example) or high ambient temperatures.
 
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