What should I do if I mistakenly overstayed my tourist visa in Thailand?

@Paul *********

and everyone,

This is an excellent example of people NOT looking at their entry stamp when they enter the country 😕 AND thinking showing up here without any visa in their passport and getting stamped in FREE for 30 days is a tourist visa <- it is NOT a visa at all, it's a free entry stamp.

AND

As far as the O/P their only option right now is to go to the immigration office, pay the 15 day overstay (at 500baht a day so 7500baht) and then apply for the 30 day extension (which will most likely be only for 15 more days <- because the overstay days count on it)

THEN when that 15 day extension runs out they will have to exit/re-enter the country.

As people pointed out you can't get a medical extension from an overstay so they need to clear the overstay, get the remainder of the 30 day extension then exit/re-enter the country to get a new 30 day visa exempt entry <- which they can also extend for 30 more days at the immigration office.

LOOK at your entry stamps when you stamp IN to the country people 😕