I have constant mouth sores and sore throats, and red and white patches all over the back of my mouth and under my tongue. what might cause this?

Candidiasis: depending on your medical history, it could be oral candidiasis, if you have an immune disorder it could be more.

Pathogens: Fungal infections (Thrush, Lichen Planus) are the usual suspects. When you have an outbreak see your Dentist or Physician for examination and biopsy. Treatment or referral may be required.

Candida or!??: It could be candidiasis , pemphigus vulgaris , pemphigoid or acute herpatic gingivostomatitis .. Do you have fever ,headache and malaise .. Please get a checkup and some urine and blood analysis if possible for candida antibodies .. It is hard to diagnose your case because of the similarities of symptoms with other cases .