When the thyroid gland produces too much thyroid hormone, leading to symptoms such as unintentional weight loss, fast heartbeat, increased sweating, more frequent bowel movements, a swollen thyroid gland, feeling tired or weak, and feeling anxious or irritable.

Underactive Thyroid (Including Hashimoto's)

When the thyroid gland doesn't produce enough thyroid hormone, it can cause symptoms like feeling tired, gaining weight, muscle aches, constipation, and feeling down or moody.