Is there any link between oral cancer and thyroid cancer? had papillary thyroid cancer now suspicious white/red patch on gums that needs biopsy

Not aware: Not aware of any link, but if you have a lesion in your mouth that is different from your normal looking gum, go see a doctor or dentist.

No: Oral cancer, generally squamous cell carcinoma, is due to smoking, local trauma or human papilloma virus. There are of course sporadic cases also. However spots/patches may be due to other causes such as infection or autoimmune etiologies.

No link: No link. Suspicious oral patches should be biopsied.