Which vital sign is most affected by hypothyroidism?

The vital sign that is most affected by hypothyroidism is temperature. In individuals with hypothyroidism, the metabolic rate is decreased due to insufficient levels of thyroid hormones. As a result, patients often exhibit a lower body temperature, reflecting the reduced metabolic activity.

Hypothyroidism leads to a slower metabolism, resulting in decreased heat production. This is why individuals with this condition frequently report symptoms of feeling cold or having lower than average body temperatures.

While heart rate can be affected by hypothyroidism as well—typically presenting as bradycardia (slowed heart rate)—the most prominent and consistent vital sign change is the drop in temperature. Blood pressure may show variations, and respiratory rate is generally not significantly altered. Therefore, the most direct and notable impact of hypothyroidism on vital signs is in body temperature regulation.