Sorry, that should say "what, IF any, symptoms do you have?. My fingers didn't want to cooperate.
Do you mean "how do you know if you have thyroid problems"? This is usually determined by a combination of blood tests (TSH, Free T3, Free T4 to start with) and symptoms.
What is any symptoms do you have? Have you had any thyroid blood work done? If so, please post results and lab ranges.