Weight changes. Hyperthyroidism can be a reason of both gaining weight and weight loss. If one does not change his/her common way of life but feels rapid body weight changings – it could definitely be hyperthyroidism.

Heartquake. Heart beating pace changings may also be caused by thyroids problems. Your heart needs thyroid hormones to work properly. Increase or decrease in the level of those hormones change the way your heart beats. For instance, hypothyroidism slows down the heart pace. A patient may not even notice this on early stages.