Thyroiditis can cause either hyperthyroidism or hypothyroidism, or one followed by the other.
Common signs and symptoms of hyperthyroidism include:
- fast heart rate (100-120 beats per minute, or higher)
- nervousness or irritability
- increased perspiration
- muscle weakness (especially in the shoulders, hips, and thighs)
- trembling hands
- weight loss, in spite of a good appetite.
Common signs and symptoms of hypothyroidism include:
- slow heart rate (less than 70 beats per minute)
- feel slow or tired
- drowsy during the day, even after sleeping all night
- poor memory
- difficulty concentrating
- muscle cramps, numb arms and legs
- weight gain
- heavy menstrual flow.