About hyperthyroidism

A close older sister was recently diagnosed with hyperthyroidism, and she has lost a lot of weight.

It seems to be a disease related to the immune system based on a quick look. The symptoms are diverse, but in this sister's case, her heart was beating rapidly and she was very tired.

He said he usually feels tired and considers hard physical work to be nothing special.

I'm curious about what exactly hyperthyroidism is and how it can be treated, given the various thyroid-related diseases.

The cause is probably genetics or lifestyle habits, but my sister didn't sleep well... It seems she endured it with mental strength, and it became a habit, but I'm upset that she's sick. ㅠ