For past few days I have observed pain in my jaw muscles while chewing, initially I ignored but now it's something which can't be ignored everytime. Next is I feel pain while even slight stretching of the muscles. my weight has suddenly increased by 5 kg, Parts are swollen like hands. cheeks.. I had a history of thyroid for which I underwent surgery. Even in breast region I feel pain if I stretch my body part so need to know whether it's a condition or something which will go after sometime.