Hypothyroidism – not enough thyroid hormonesHypothyroidism occurs when the thyroid gland fails to produce sufficient thyroid hormones.Hashimoto’s Disease is related to hypothyroidism -it’s an autoimmune disorder. In other words, it’s a problem with your immune system rather than your thyroid gland. However, from an underwriting perspective, it is treated similarly to hyperthyroidism – if well controlled with medication, you should get the normal price for your cover.Hyperthyroidism – too many thyroid hormonesHyperthyroidism is when an overactive thyroid gland produces excessive thyroid hormones that circulate in the blood.