The thyroid gland is considered one of the most important endocrine glands in the human body. It controls blood pressure, heart rate, temperature, weight, and other vital functions.The aim of this study is to evaluate the level of lipid in patients with hypothyroidism. The study was included 60 female patients with hypothyroidism and 40 healthy women, who were considered as control group, in the age group range from 22 to 44 years.The results of this study showed that subjects with hypothyroidism had significant increase in the level of lipids, as the levels of total cholesterol, triglycerides, and low-density lipoprotein were (248.0±59.3, 226.7±52.5, and 145.0±32.6) mg/dL, respectively. , compared with the control group, (189.1 ±30.5, 189.6 ±36.1, 95.8 ±22.9) mg/dL, respectively. While the level of high-density lipoprotein cholesterol and very low-density lipoprotein, there were high differences, as it reached (50.5 ± 11.6, 42.8 ± 12.1) mg /dL compared to healthy subjects, which amounted to (55.1 ± 13.7, 38.2 ± 11.2), mg/dL. We conclude from this study that hypothyroidism leads to an increase in the level of fats, due to a decreasing in metabolic processes, which is also the cause of hyperlipidemia.