Overactive thyroid
Your thyroid gland produces too much thyroid hormone, which leads to hyperthyroidism, or an overactive thyroid. Numerous bodily processes, including metabolism, are regulated by these hormones. Even if you have a good appetite, an overactive thyroid will cause you to burn calories very quickly. Hyperthyroidism can accelerate your body's metabolism, causing unintentional weight loss and a rapid or irregular heartbeat.
Additional signs include:
- Fast, irregular heart rate
- Anxiety
- Fatigue
- Heat intolerance
- Sleep troubles
- Hand tremors
- Light periods in women
- ...
Possible causes of hyperthyroidism include:
- Graves’ disease
- Thyroiditis
- Eating too much iodine
- Taking too much thyroid medicine
- ...
