doctor examining patients thyroid

You feel tired and wired all the time.

Hyperthyroidism is caused by an overactive thyroid, meaning the thyroid gland produces too much thyroid hormone. This increases metabolism and causes an initial surge in energy levels. Over time, however, this can result in exhaustion. People with hyperthyroidism often experience disrupted sleep patterns and insomnia despite feeling exhausted, further exacerbating the problem. Low levels of TSH may indicate hyperthyroidism.