Hello pls I have this month odour  since 2018, now 21yrs . and I've tried different medications since then but to no avail, I believe its from my stomach/ inner organ. I even perceive the really foul smell just from my nose. I'm a student and it has affected me academically and socially. every time I brush there's always alot of mucus ruining down my throat ,  I don't drink or smoke.. so i would like to know what could be the cause??