An overactive thyroid is where the thyroid produces too much of the thyroid hormones. It can affect both men and women but it is 10 times more common in women.
Overactive thyroid
Symptoms of an overactive thyroid include nervousness and anxiety, mood swings, difficulty sleeping, tiredness, heat sensitivity, heart palpitations and weight loss.
Underactive thyroid
An underactive thyroid is where the thyroid does not produce enough of the thyroid hormones.
Symptoms of an underactive thyroid include tiredness, sensitivity to cold, weight gain, constipation, depression, muscle aches, dry skin, brittle hair and nails, loss of libido and irregular periods.