iPhone Overheating? Causes, Fixes & When to Worry

Did You Know?

Quick answer: iPhones get warm during heavy use — that's normal. Actual overheating (too hot to hold, temperature warning) usually indicates software issues, environmental factors, or battery problems. See our battery health guide for more.

Your iPhone is getting hot. Really hot. Maybe you've seen the temperature warning screen, or maybe it's just uncomfortably warm. Either way, persistent overheating can damage your phone and indicates something needs attention. If your battery is also draining quickly, these issues are often connected.

Did You Know?

Our iPhone Overheating Diagnosis Results (2025)

• • 234 overheating iPhones diagnosed
• • 52% were software/app related - resolved with settings changes
• • 31% had degraded batteries - replacement fixed the heat issue
• • 12% had charging system issues - port or IC problems
• • 5% had logic board issues - more complex but often repairable
• • Most common trigger: iOS updates on older devices

Data from celltech repair logs, January-December 2025

Normal Warmth vs. Actual Overheating

First, let's distinguish between normal and problematic heat:

Immediate Steps If Your iPhone Is Overheating

1. Stop using it — Close all apps and let it rest
2. Remove the case — Cases trap heat; let the phone breathe
3. Move to a cool place — Out of direct sunlight, away from heat sources
4. Turn off if needed — If it's extremely hot, power off completely
5. Don't put in fridge/freezer — Rapid cooling can cause condensation damage

Warning

Never charge an overheating iPhone. Charging generates additional heat. Wait until the phone cools to room temperature before plugging in.

Common Causes of iPhone Overheating

1. Environmental Factors

• Direct sunlight: Leaving your phone in the sun, on a car dashboard, or by a window
• Hot environments: Using the phone in extreme heat (above 35°C/95°F)
• Wireless charging: Generates more heat than wired charging — combine with a case and you've got a problem

2. Software Issues

• Background apps: Apps running constantly in the background, using CPU
• iOS bugs: Sometimes a recent update causes excessive CPU usage
• Rogue apps: Poorly coded apps that don't release resources properly
• Indexing: After a restore or update, Spotlight indexes everything — heavy CPU use for 24-48 hours

3. Heavy Usage

• Gaming: Graphics-intensive games push CPU/GPU hard
• Video recording: Especially 4K, uses significant processing power
• Augmented reality: AR apps use camera, GPS, and graphics simultaneously
• Navigation: GPS + display + data = heat

4. Hardware Problems

• Degraded battery: Old batteries work harder and generate more heat — check your battery health
• Damaged battery: Physical or liquid damage can cause dangerous overheating
• Logic board issues: Liquid damage or component failure can cause constant heat

Software Fixes

Check Battery Usage

Go to Settings → Battery. Look at the last 24 hours — is any app using disproportionate battery or showing high background activity? That's likely your culprit.

Force Restart

A force restart clears stuck processes that might be causing excessive CPU usage. Press and release Volume Up, Volume Down, then hold Side button until Apple logo appears.

Update iOS

Settings → General → Software Update. If an update is available, install it — Apple often fixes bugs that cause overheating.

Reset Settings

Settings → General → Transfer or Reset → Reset → Reset All Settings. This won't delete your data but can fix configuration issues causing problems.

Preventing Overheating

• Remove case while charging, especially wireless charging
• Avoid using phone in direct sunlight
• Don't leave phone in hot car
• Close apps you're not actively using
• Reduce screen brightness
• Turn off Background App Refresh for non-essential apps
• Use Low Power Mode during intensive tasks

When It's a Hardware Problem

If your iPhone overheats even when idle, during light use, or the battery is bulging, it's a hardware issue requiring professional attention.

Warning Signs

• Phone gets hot when you're not using it
• Back of phone is warmer than the screen (battery location)
• Battery health is below 80%
• Phone was dropped or exposed to liquid
• Screen is lifting away from the frame (battery swelling — STOP USING)

UK Repair Costs

Frequently Asked Questions

Can overheating damage my iPhone permanently?

Yes. Prolonged high temperatures can degrade the battery faster, damage internal components, and in extreme cases cause permanent screen or logic board damage.

Why does my iPhone overheat while charging?

Charging generates heat normally. If it's excessive, you may be using it while charging (double heat generation), using a non-Apple charger, or have a degraded battery. If charging issues persist, see our iPhone charging slowly guide.

Is it safe to use my iPhone if it's warm?

Warm is fine and normal during heavy use. Hot (uncomfortable to hold) or displaying a temperature warning means you should stop and let it cool.