What could be causing my phone (or charger) randomly heating up while charging?

It happens rarely, but I will notice either my phone or the charger getting pretty toasty randomly. What could be causing this?

9 comments

Faster or more charging requires more power and therefore more heat is produced. If your phone is at 20% and you charge it, it will be charged at a higher rate than if you were charging it at 90%.

If you have an inductive charger, a wireless charger, those heat up due to the nature of their design when in use.

Edit: Don't rule out malfunction as the cause. The charger, cable, or phone could be creating an unsafe operating state.
- Also, depending on your habits, it's possible for your phone to rarely fast charge.
  
  Android will intentionally slow charge if it seems like bedtime, and will aim to hit 100% when your alarm goes off.
  
  Source?
You should post your phone, the cable and the charger (specs) Also the soc at the beginning of the charging process.
- soc = state of charge (battery percentage)

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