Hi! Thank you for your question.
A common cause of your heat inside can be
dehydration. Usually the very young and very old people, also
obese people are vulnerable to dehydration.
Do you take any medication? There are some medicines such as diuretics, anticholinergics and neuroleptics that cause the body to be warm.
It also can be a problem with your sweat glands, if you don`t sweat enough. There are also some diseases, but as you mention you do never have
fever.
I would recommend you drink plenty of water during the day, and apply cool wet cloths to your skin.
Also do a
blood test to check if there is any problem. If you don`t feel tired, if you are sweating normally there is no need to worry.
I hope this helps. Have a nice day!
Feel free to contact me again.
Dr. Migena GEGA