Phone Overheating? Why It Happens and How to Cool It Down

The screen has gone dim on its own, charging has stopped at 62%, and the back of the phone is hot enough that you’d rather not hold it. That’s phone overheating, and it’s different from the warmth you feel after a long video call. One is normal. The other is the phone protecting itself, and if it keeps happening your battery is wearing out faster than it should.

If your phone is hot right now, start with the first section. The rest explains why it happened.

Cooling it down right now

1. Stop what’s running. Close the game, camera or navigation app.
2. Unplug it if it’s charging.
3. Take the case off. Thick cases hold heat in.
4. Get it out of the sun, into shade or an air-conditioned room.
5. Turn on Airplane Mode, or switch it off for a few minutes.
6. Let it cool at room temperature. Air from a fan is fine.

How warm is too warm?

Phones have no fans, so they push heat out through the frame, glass and screen. Short spells of warmth are expected while charging (more so with fast or wireless charging), while gaming, recording video, navigating or on video calls, for a few days after a major update while the phone re-indexes data, and while setting up a new phone and restoring a backup.

Not normal: too hot to hold comfortably, hot while idle in your pocket, or warnings that keep coming back. Sustained heat speeds up battery ageing, and phones defend themselves by throttling the processor, dimming the screen, pausing charging or shutting down.

What’s making it hot

Games, 4K video and the chip you happen to have

Games, 4K recording and long camera sessions work the processor and graphics hard, and some chips simply run warmer. Android Authority tested a Galaxy S26 Plus with Samsung’s Exynos 2600 against a Snapdragon 8 Elite Gen 5 rival. In a three-minute Asphalt Legends run the Samsung reached about 39°C, against about 32°C on the Xiaomi 17 Ultra. In the worst case it approached 45°C, and over a 13-minute session its frame rate dropped by 29% as it throttled. The reviewer’s verdict was that it stayed usable, just hotter.

The camera can be worse. Notebookcheck reported in November 2025 that a reviewer’s OnePlus 15 hit around 50°C while recording video outdoors, stopped recording and disabled the camera for five minutes. That was the phone protecting itself, and it shows how fast sun plus video can heat any flagship.

Charging

Charging always makes heat, and fast or wireless charging makes more. Doing it while gaming, under a pillow or inside a thick case traps it.

Where you are

Direct sun, a car dashboard or a hot room raise the starting temperature, so the phone reaches its limits sooner.

Something running in the background

An app stuck in a loop, constant syncing or post-update indexing can keep the processor busy with the screen off. That’s why heat and battery drain so often turn up together.

Weak signal

In poor coverage the modem works harder. A long call or navigation in a weak-signal area can noticeably warm the top of the phone.

A failing battery or damage

A worn, damaged or swollen battery, or damage from a drop or liquid, can make the phone hot even when it’s idle. That’s a repair, not a settings change.

Hot on the charger

• Use the original charger or one that meets the maker’s spec: USB-C PD for iPhone and Pixel, Samsung’s PPS chargers for Super Fast Charging. Cheap uncertified chargers and damaged cables are a common cause.
• Take off thick or leather cases, especially on wireless chargers.
• Don’t charge under pillows, blankets or on a sofa.
• Don’t game or stream video while charging. That stacks the two biggest heat sources.
• Turn on battery protection. iPhone: Settings › Battery › Charging (Optimized Charging, or an 80% limit on supported models). Samsung: Settings › Battery › Battery protection. Pixel: Settings › Battery › Charging optimization on supported models.
• Clean the port gently with a wooden toothpick if the plug feels loose. Lint can cause a poor connection, and that makes heat.

Hot during games

Gaming is the hardest work a phone does. Xiaomi’s own support advice for gaming heat applies to any brand: lower the game’s graphics and frame rate, use a balanced performance mode instead of “boost” or “turbo”, close background apps, play somewhere cooler, and don’t game on the charger.

On Samsung, Game Booster settings can cap the frame rate, and many games have a battery-saver graphics preset. A short break every 20 to 30 minutes lets the phone shed heat before it starts throttling.

Warm in your pocket and the battery’s falling

Something is running in the background. Check Settings › Battery (iPhone or Android) for the app that used the most, then:

1. Restart the phone.
2. Update or reinstall the app with the highest background use.
3. If it started after a system update, give it a few days to finish indexing and install the next patch.
4. Look for apps you don’t recognise. Unknown apps with device-admin or accessibility access deserve a closer look, which our guide on how to tell if your phone is hacked goes through.

On an iPhone that’s been hot since the latest update, our iOS 27 problems and fixes guide lists what Apple has already patched.

Signs the battery or hardware is the problem

No setting fixes these. Stop using the phone and take it to the manufacturer or an authorised repair shop if:

• It gets hot while idle with nothing running.
• The back or screen is lifting, or it no longer lies flat. That’s a swollen battery.
• You smell burning or chemicals.
• The heat started after a drop or contact with water.
• It shuts down again and again at a normal battery level.

Liquid damage often shows up as heat, charging faults or a phone that won’t switch off properly. Our phone water damage check covers the signs. If it might still be under warranty, find out before paying for a repair: a Samsung Info report or a Google Pixel Info check shows warranty details for those brands, and an Apple full GSX report covers iPhones.

A used phone that “just gets a bit warm”

When a seller says that, take it as a warning. Heat at idle can mean a failing battery, old water damage or a poor repair. Before you pay:

• Open the battery health screen and read it yourself.
• Use the phone normally for a few minutes, then feel the back.
• Leave it idle with the screen off for a while and feel it again.
• Check the IMEI. Your first All-in-one Basic Info check is free: