Hello there,
TSH is the hormone from brain (pituitary) that pushes the thryoid gland of signals it to secreat T3&4. It's like a cell phone tower for your easy understanding which sends more signals when the reception is less at the user end (if thryoid isn't secreating enough T3&4, brain sends more TSH down to
thyroid).
Thyroid hormones (T3&4) maintains the BMR (basal metabolic rate) for normal function of body. Let's say more signal at the user end, cell phone heats up and less signal makes the user end weak. Similarly more T3&4 body had all hyper effects and less hormones makes body weak and dull.
Next Steps
Symptoms might want depending on individual and it's always recommended to go for the bloods after an over night fasting.
Health Tips
Few veggies that we consume have a say on the hormones esp cabbage, cauliflower and a few others. So fasting
thyroid profile when done is the best predictor of your thyroid status.