It is a relatively common problem for an iPhone (or any smartphone) to heat up or even burn your hands during use, and it can be caused by a variety of reasons. Here are some workarounds and precautions:
Close or uninstall apps you're not using: Applications running in the background may consume CPU resources and cause heating.
Avoid prolonged use of high-performance applications: such as gaming, editing, or other high-load applications.
Reduce screen brightness: High screen brightness increases battery usage, which generates more heat.
Turn off location services and background app refresh: These features also consume battery and processor resources when not in use.
Remove the phone case: Some phone cases may hinder heat dissipation.
Avoid using or storing your phone directly in the sun: Direct exposure to sunlight heats up rapidly.
Check the condition of the battery: There is a battery health feature in the iPhone's settings, and if the battery performance is significantly reduced, the battery may need to be replaced.
Stay up-to-date with the latest operating system and app updates: This fixes known performance issues and security vulnerabilities, helping to reduce the operating temperature of the device.
Do not use your phone while charging: Using the phone while charging, especially for high-load tasks, can cause extra heat.
Use the original charger and cable: Non-original or low-quality charging accessories may cause inefficient charging and overheating.
Restart your phone: Sometimes a simple reboot can fix overheating due to software issues.
Factory reset: If the problem persists, try a factory reset after backing up your data. This excludes heat generation due to software configuration issues.
If the above steps do not resolve the issue, it may be caused by a hardware failure. Contact Apple's official support or authorized repair center for inspection and repair.
Note: Constant overheating may damage the internal components of the phone and shorten the life of the device. If the fever problem occurs frequently and the solution is ineffective, it should be dealt with promptly.