How to Fix iPhone Overheating After iOS 18 Update (Complete Cooling Guide)

1 Check Background Activity (Most Common Cause)

After installing iOS 18, your iPhone performs heavy background tasks such as indexing photos, optimizing storage, and syncing apps. This process increases CPU usage, which leads to overheating.

Go to Settings > Battery and check which apps are consuming the most power. If any app is using excessive battery in the background, force close it or disable its background activity.

This step is crucial if your iPhone overheating after update or iPhone getting hot for no reason.

If your battery is also draining fast, check our iPhone Battery Drain Fix guide.

2 Reset All Settings (Fix Hidden System Bugs)

Sometimes old settings conflict with new iOS 18 configurations, causing the processor to overwork continuously. Resetting all settings can fix overheating without deleting your personal data.

Go to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings.

This will reset WiFi, Bluetooth, and system preferences, but your photos and apps remain safe.

This method is highly effective for iPhone overheating iOS 18 fix and iPhone heating issue after update.

3 Manage Location Services

Location Services (GPS) continuously run in the background and can significantly increase device temperature. Many apps use location even when not needed.

Go to Settings > Privacy & Security > Location Services and set apps to "While Using the App" or turn them OFF completely.

This reduces CPU load and helps fix iPhone overheating problem quickly.

4 Avoid Using iPhone While Charging

Using your iPhone while charging—especially for gaming, video streaming, or TikTok—generates double heat from both the battery and processor.

Always let your iPhone charge without heavy usage. This is one of the easiest ways to prevent iPhone overheating while charging.

If your device also has charging issues, check our iPhone Not Charging Fix.

5 Update Apps and iOS

Outdated apps may not be optimized for iOS 18, causing excessive CPU usage and overheating. Developers release updates to fix compatibility issues.

Go to the App Store and update all apps. Also check Settings > General > Software Update for any iOS patches.

This helps fix iPhone overheating after iOS update and improves overall performance.

6 Improve Network Signal

Weak mobile signal forces your iPhone to constantly search for a better connection, which increases heat and battery usage.

Switch to WiFi when possible or enable Airplane Mode temporarily in low-signal areas.

This is especially useful if your iPhone gets hot during internet use or streaming.