Often none. With the most common inflammation of the thyroid (hashimoto's thyroiditis-ht) the inflammation is chronic and bland, so there are no direct symptoms. Sometimes the thyroid can become enlarged and that can be felt by the patient. Subacute thyroiditis is an acute severe inflammation of the thyroid and patients can be very uncomfortable with severe neck pain and general flu-like symptom.
Many. Fatigue, constipation, dry skin, losing hair, weight gain-usually water weight- are most common for underactive shaky nervous jittery, sweaty, fast heart beat, multiple bowel movenents daily for overactive so see md-get lab evaluation.