Thyroid gland is an endocrine gland which secretes thyroid hormones useful for various metabolic processes in the body. It releases triiodothyronine (T3) and thyroxine (T4). Thyroid hormones regulates the basal metabolic rate (BMR) of almost all the cells such as hepatocyte cells of liver, cardiovascular function, energy balance and lipid metabolism. Disturbance in the level of thyroid hormones may alter the normal bilirubin metabolism and normal hepatic circulation.