Our body's dependency on thryoid hormones means that as soon as there's a problem with it, we feel it in many ways, says Douglas S. Ross, M.D., co-director of Thyroid Associates at Massachusetts General Hospital. Hyperthyroidism, when your thyroid produces too many hormones, may make all of the bodily systems speed up, leading to consequences like feeling nervous, anxious, sweaty, or losing a lot of weight.