2 yrs back I got some white spots in my mouth linings and some swelling in cheeks and somehow i feel inside of my mouth totally swollen including tongue. I went online and check the syptoms And got some indication that of oral cancer . I had been smoking moderatly in last 20 yrs and I am 43 now. As the time passed I got pain in my temple bones, jaw bone, skull , shoulder bone ,neck region and around my ears. The pain is not severe but when I apply some pressure i feel it. I went to ENT , NEURO, GP and ONCOLOGYST also n body coud diagnose it. I decided to go for WHOLE BODY PET scan on my own. Last week reports came and it sayys that no malignancy seen or observed . Where to go now ? Can any gentleman tell me taht if any type of cancer cells go undetected in PET SCAN. I am totally frustrated . Please advise.