A Galaxy S23 is the compact one of its family, a 6.1-inch phone that packs a Snapdragon 8 Gen 2 chip into a small frame, and a small frame warms quickly. Most heat is explained by what you are doing: a long game, 4K video, a navigation app in a hot car, or a charge while you are also using the phone. What deserves attention is heat with the screen off, heat that arrived with an update, and one particular pattern reported after One UI 8: the phone warms the moment the camera opens and the picture trembles as you change zoom, which owners cured by clearing the camera cache and installing the next patch.
Differential
Likely causes of “Samsung Galaxy S23 gets hot or shows a temperature warning”, and how to tell them apart
- 1
A long game or video session
What separates it The back is hot after twenty minutes of play, the screen dims, and the frame rate falls
How to confirm Take a break; the chip throttles itself on purpose, and a lower brightness or graphics setting reduces the load
- 2
Charging while in use
What separates it The camera area is hottest while the phone is plugged in and you are using it
How to confirm Charge it idle, on a hard flat surface, with the case off, and compare
- 3
The camera app after One UI 8
What separates it Warmth begins when the camera opens, and zoom looks shaky
How to confirm Settings, Apps, Camera, Storage, Clear cache; then install the next patch
- 4
A case that traps heat
What separates it The phone stays warm for an hour after a charge
How to confirm Take the case off for a day of normal use and compare
- 5
A background app in a loop
What separates it The phone is warm in a pocket with the screen off
How to confirm Run Safe mode for a day; if it stays cool, remove recent apps one at a time
Before you touch a setting
Record this first — changing settings destroys the evidence
- When it is warm: charging, camera, a game, or idle
- The case and charger in use
- The top app in Battery usage
- The One UI version and patch date
Try in this order
0 of 6 completedStop and cool
ReversibleClose the apps, remove the case, switch the screen off and leave the phone in shade. Sudden cold from a fridge risks condensation inside.
Check Battery usage
ReversibleSettings, Battery, Battery usage. A game or the camera at the top has an obvious explanation; a social app with long background time does not.
Clear the camera cache
ReversibleSettings, Apps, Camera, Storage, Clear cache. Owners who saw heat and zoom shake after One UI 8 reported that this plus the next patch fixed it.
Charge in cooler conditions
ReversiblePlug the Samsung 25 W charger into a wall socket, lay the phone on a hard surface and leave it alone for the charge.
Install the newest update
ReversibleSettings, Software update. Later patches fixed several One UI 8 problems on the S23 series.
Run Safe mode for an hour
ReversibleHold the side key, touch and hold Power off and tap Safe mode. If the phone stays cool, the cause is an app you installed.
Model-specific
What is true of this model and not of its siblings
- A small frame, a fast chip
- The S23 pairs the Snapdragon 8 Gen 2 chip with a 6.1-inch body and a 3,900 mAh cell, so it reaches its thermal limit sooner than the S23+ or the Ultra.
- What throttling looks like
- A dimmed screen, a falling game frame rate, slower charging, and a camera that shuts a mode off are the phone protecting itself, not a defect.
Stop boundary
When this stops being a self-service repair
- !If the phone stays hot while idle in Safe mode, book a Samsung check
- !If only the camera app warms the phone after clearing its cache, install the next patch and report it through Samsung Members
- !A swollen case or a burning smell means service now
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why does my S23 get hot when I open the camera?+
Owners reported camera heat and shaky zoom after One UI 8. Clearing the Camera app cache and installing the next patch were the fixes they reported.
Does 5G make the S23 hotter?+
Where the signal is weak the radio works harder and the phone warms. Setting Mobile networks to LTE in a poor-signal area lowers the heat and the drain.
Is the S23 hotter than the S23 Ultra?+
Under the same load the smaller S23 shows heat sooner because it has less body to spread it across.
When is warmth a real fault?+
When the phone is hot with the screen off and nothing running in Safe mode, or when the back is swelling.