Many experiences of that. The chinese TCM call that 热气 ("heatiness"). Excess of fried food, toasted stuff etc likely to cause it. BUT...General message to ever

Many experiences of that. The chinese TCM call that 热气 ("heatiness"). Excess of fried food, toasted stuff etc likely to cause it. BUT...General message to everyone....anything that seems not normal, and persist more than a few days.... GO SEE A DOCTOR. What is the cost of a visit vs the value of your life? In any case go visit every year to get a checkout if you can afford so. Its a duty to those your care for and to those you care about.