What are the symptoms of an overactive thyroid?
 1 hyperactivity. 2 mood swings – such as anxiety, irritability and nervousness. 3 difficulty sleeping (insomnia). 4 feeling tired all the time (fatigue). 5 muscle weakness. 6 a swelling in your neck caused by an enlarged thyroid gland (goitre). 7 irregular and/or unusually fast heart rate (palpitations). 8 trembling or shaking (tremor). 9 warm, moist skin. 10 redness on the palms of your hands. 