Why Is My Phone Overheating? Causes & Fixes
A warm phone is usually nothing to worry about — a hot one is your phone protecting itself. Here are the real causes, from sun and gaming to a failing battery, and exactly how to cool it down without doing harm.
Almost every phone gets warm sometimes, and most of the time that is completely fine — it is just physics. The question worth asking is whether your phone is merely warm after a demanding task, or genuinely overheating to the point where it throttles performance, dims the screen, or flashes a temperature warning. The two have different causes and different fixes. Below we walk through the real reasons phones overheat, the safe way to bring the temperature down fast, and the one symptom — a swelling battery — that you should never ignore.
Key takeaways
- Warm is normal during gaming, navigation, video or fast charging; too hot to hold or a temperature warning is not.
- The top causes are direct sun/heat, charging while using the phone, heavy apps, a weak signal, a runaway background app, or a recent software bug.
- Cool it down by removing the case, stopping charging, closing heavy apps, lowering brightness and letting it rest in the shade — never the freezer.
- A hot, swollen battery is a safety risk — stop using it and get it serviced; never puncture or bend it.
Warm versus overheating — how to tell
A phone running a game, recording 4K video, navigating with GPS, or fast charging will get warm; that heat is the processor and battery doing real work, and it is by design. Apple and Android makers build phones to operate in an ambient range of roughly 0°C to 35°C (32°F to 95°F), and they tolerate brief warmth above that internally. The line into overheating is crossed when the phone becomes uncomfortable to hold, throttles itself (apps stutter, the screen dims, charging pauses), shows an on-screen temperature warning, or gets hot while doing nothing demanding at all. That last case — heat with the screen off — is the clearest sign something is wrong.
The real causes of an overheating phone
Overheating almost always comes down to one of these, and often a combination. Working through them in order usually reveals the culprit.
- Direct sun or a hot car. The single most common cause. A phone left on a dashboard, by a pool, or in your hand under summer sun heats up fast — external heat the cooling system simply cannot fight.
- Charging while gaming or streaming. Charging produces heat; so does heavy use. Do both at once and you stack two heat sources, which is why phones get hottest during a long gaming session on the charger.
- Heavy apps, GPS or the camera. 3D games, sustained video recording, turn-by-turn navigation and augmented-reality apps push the processor and GPU hard for long stretches.
- A runaway background app. A misbehaving app stuck in a loop can hammer the CPU invisibly, heating the phone even when the screen is off and draining the battery alongside it.
- A weak signal. In a low-coverage area the radio works much harder to hold a connection, which warms the phone — noticeable on trains, in basements or out in the country.
- A software bug after an update. Occasionally a new OS or app update introduces a fault that spikes background activity until a follow-up patch fixes it.
- A swelling or failing battery. An aging or damaged battery runs hotter and less efficiently. Combined with physical swelling, this is the one cause that is a genuine safety issue.
- A case trapping heat. Thick or insulating cases hold heat against the back of the phone, especially during charging, so the device cannot shed warmth.
- Malware or a crypto-miner. Hidden malicious software can quietly max out the processor to mine cryptocurrency or run background tasks, producing constant heat and battery drain.
How to cool a hot phone down
When your phone is already too hot, work through these steps and the temperature should fall within a few minutes. Think of it as removing heat sources one by one.
Remove the case and get out of the heat
Take off any case so the phone can radiate heat, and move it out of direct sun into shade or an air-conditioned room. Removing the external heat source is the fastest single fix.
Stop charging and using it at the same time
If it is on the charger, unplug it — and stop the demanding task. Don’t game, stream or video-call while charging. Letting the phone sit idle and unplugged lets both heat sources fade.
Close heavy apps and lower brightness
Close games, camera, navigation and any app you are not using. Drop the screen brightness (the display is a real heat source) and switch off auto-brightness boost if you are in bright light.
Turn off 5G, Bluetooth and hotspot temporarily
Radios add heat, especially with a weak signal. Toggle off 5G (or switch to LTE), Bluetooth, Wi-Fi hotspot and location services for a few minutes — or use Airplane Mode — to give the phone a rest.
Update or uninstall the culprit app, then restart
Check battery settings for an app using unusual power; update it or uninstall it. Then restart the phone — a reboot clears a stuck background process. If the heat began right after a system update, install the next patch.
Let it cool gradually — never the freezer
Power it off if it is very hot and let it return to room temperature naturally in a shaded spot. Do not put it in the fridge or freezer; the temperature shock causes condensation that can short out the electronics.
Never use the freezer to cool a phone. Rapid cooling forms condensation inside the device, which can short-circuit the board and cause damage far worse than the heat itself. Always cool gradually at room temperature, in the shade, away from direct sun.
The one danger you can’t ignore: a swollen battery
Most overheating is harmless once you cool the phone down. The exception is a swelling battery. Lithium-ion cells can swell as they fail, and a swollen battery is a fire and rupture risk. Tell-tale signs: the back cover bulges or lifts, the screen starts to push up out of the frame, the phone rocks instead of sitting flat on a table, or gaps appear around the edges. If you see any of these alongside heat, treat it seriously.
A hot, swollen battery is a safety risk — stop using it now. Do not charge it, do not press, bend or puncture it, and keep it away from heat and flammable materials. Power the phone down if you can do so safely, place it somewhere fire-safe, and take it to a professional or the manufacturer for a proper battery replacement and safe disposal. Never try to remove or pierce a swollen battery yourself.
Normal versus dangerous temperatures
This table gives a rough guide to what different temperatures mean. Phones don’t usually show you an exact reading, so go by how the phone feels and behaves as much as by numbers.
| Range | How it feels | What it means | Action |
|---|---|---|---|
| 0–35°C ambient | Cool to warm | Normal operating range | Use as usual |
| Warm after heavy use | Noticeably warm | Expected under load | Take a short break if uncomfortable |
| Too hot to hold | Uncomfortable, throttling | Overheating — protecting itself | Cool it down (steps above) |
| Temperature warning shown | Very hot, screen dims | Forced cooldown | Stop, set it aside to cool |
| Hot + swollen battery | Hot and bulging | Safety hazard | Stop using; get it serviced |
Preventing overheating long-term
A few habits keep heat under control. Keep the phone out of direct sun and never leave it in a parked car. Avoid heavy use while fast charging. Use a slim, breathable case — or take a thick case off during charging or gaming. Keep your apps and operating system updated so bug-related heat gets patched, and uninstall anything you no longer use. If one phone runs hot constantly even after all this, the battery may be near the end of its life, which also shortens runtime; our guides on extending phone battery life and speeding up your phone both help reduce the load that generates heat. Persistent heat with the screen off can point to a compromise — it is worth checking whether your phone has been hacked, learning to remove malware, and clearing out misbehaving apps via clearing app cache on Android. Laptops suffer the same problem; if yours overheats, see how to check CPU temperature and improve laptop battery health.
Frequently asked questions
Is it normal for my phone to get warm?
Yes. Phones are designed to run between roughly 0°C and 35°C (32°F to 95°F) ambient, and they get noticeably warm during heavy tasks such as gaming, video recording, GPS navigation, fast charging or restoring a backup. Warm to the touch is normal. Too hot to hold comfortably, a temperature warning on screen, or heat while doing nothing demanding is not normal and is worth investigating.
Why does my phone get hot while charging?
Charging always generates some heat, and fast charging more so. It becomes a problem when you also use the phone heavily — gaming, streaming or video calls — while it charges, because both the battery and processor produce heat at once. Direct sun, a thick case, or a cheap charger make it worse. Stop using the phone while it charges, remove the case, and move it somewhere cool, and the temperature should drop quickly.
Should I put my overheating phone in the freezer or fridge?
No. Never put a phone in the freezer or fridge. Rapid cooling causes condensation inside the device, which can short-circuit the electronics and cause damage that is worse than the heat. Instead, turn the phone off or close demanding apps, take off the case, and let it cool gradually in a shaded, room-temperature spot away from direct sun.
My phone battery is swollen and hot — what should I do?
Stop using and charging it immediately. A swollen battery — a back cover that bulges, a lifting screen, or a phone that no longer sits flat — is a safety hazard. Do not press, bend or puncture it, and keep it away from heat. Power the phone down if you safely can, place it somewhere fire-safe, and take it to a professional repair centre or the manufacturer for proper battery replacement and disposal.
Can a virus or bad app make my phone overheat?
Yes. A buggy app, a runaway background process, or malware such as a hidden crypto-miner can keep the processor working hard and heat the phone even when the screen is off. Check your battery settings for an app using an unusual amount of power, update or uninstall it, restart the phone, and scan for malware. A software bug after an update can also cause it, in which case installing the next update usually resolves it.
Last updated 20 June 2026. Temperature guidance reflects current Apple, Google Pixel and Samsung operating-temperature documentation; your phone’s exact thresholds may differ by model.
Sources & further reading
- Apple Support — Keep iPhone within acceptable operating temperatures
- Google Pixel Help — Fix a Pixel phone that’s overheating
- Samsung Support — Galaxy phone is overheating or getting warm
This guide is independently produced. We reference primary documentation from device makers and security authorities (NIST, CISA). Tudug is reader-supported and may earn from ads.