There are maaaaannnnnyyyyy possible reasons. Many.
Is your SIM good? Are your signals good? Have you done any app Cached Data clearing of late, or Cache Partition wipes, which might help?
"Heat is work and work is heat", as physicists assure us. There will always been some heat produced when you are using the CPU, whether for Camera or any other app. I just checked my temperatures...about 90°F battery, and about 104°F for CPU.
My own personal temperature I assume to be 98.4°F, and I feel fine. Probably your phone is fine too if the temperatures are not much higher.
Hi,
I've got the same problem.
Got my Nexus 5 4 days ago and with the lightest use (examples: facebook, chrome whatsapp) iets hearing up.
When i dont use the phone iets about 29°C when i facebook/brosse its 34°C tot 40°C. My question is must I return my phone?