The thyroid gland, situated in the front of the neck, is responsible for producing hormones which control our metabolism.

Common symptoms of an underactive thyroid gland - known as hypothyroidism are weight gain, low body temperature, constipation, hair loss, dry flaky skin, fluid retention, slow reflexes, fatigue, rapid aging, slowness of thought and cognition, goitre (enlarged thyroid) - not always present, depression, loss of interest in sex, carpel tunnel syndrome, puffiness around the eyes