Often not at all. If they do not produce excess thyroid hormone, they have minimal effect on the rest of the body unless they are actually follicular cancers, and spread to other parts of the body. If they do overproduce thyroid hormone, typical hyperthyroid symptoms may occur: feeling hot, shaky, sweaty, heart pounding, poor sleep, poor concentration, bone loss, weight loss or weight gain., ^ appetite.
No effect usually. Most follicular nodules do not effect your body unless they are very large and compress the trachea or esophagus.
They don't. Follicular adenomas must be distinguished from follicular cancer, but the nodules themselves don't produce additional hormones that will cause symptoms.