Not necessarily. Oedema due to hyperthyroidism is mainly due to the accumulation of mucopolysaccharides in the extracellular matrix and the appearance of sunken oedema. In hypothyroidism, on the other hand, oedema of the ankles and dorsum of the feet may also occur, mainly due to autoimmune damage and hormonal disruption leading to water and sodium retention. Therefore, both hyperthyroidism and hypothyroidism can present with oedema, and a differential diagnosis needs to be made in conjunction with clinical investigations such as thyroid function tests.