How does hypothyroidism cause dry skin?
Thyroid hormones produced by the thyroid gland act on nearly every cell in the body. The thyroid hormones are responsible for regulating metabolism, heart rate and body temperature. They also play a role in protein synthesis, muscle contraction, and the rate at which new cells are made. (2)
When thyroid hormone levels are low, the regeneration of skin cells is significantly slowed. This results in dead skin cells remaining on the skin’s surface for a longer period of time, causing dry, dull and flaky skin.
Thyroid hormones also regulate metabolism. When thyroid hormones are low, metabolism slows down significantly. A slow metabolism results in reduced sweat production. (3) Sweat acts as a natural moisturizer for the skin, keeping your skin well-hydrated. A lack of sweat can therefore lead to cracked, dry, thick, and flaky skin.