It really depends on where the pain is emanating from, it could be 3 possibilities: 1. you may have eaten something which has got stuck between 2 teeth and injured the interdental gum. 2. You have a hidden cavity which is touching the nerve of the tooth or 3. Gum infection involving all the gums.
Next Steps
Get yourself examined by your dentist. Possibilities 1 & 3 need a clean up, possibility 2 needs more treatment.
Health Tips
A clean up is recommended for all every 6 months.