Causes of hypothyroidism in children include lack of a functioning thyroid gland at birth (congenital hypothyroidism) or acquired factors such as iodine deficiency in the diet (endemic goiter). Autoimmune diseases. Damage to the thyroid gland, etc. The clinical manifestations of hypothyroidism in children depend on the age of the child and the time of disease onset. Congenital hypothyroidism: 1. It can appear in the neonatal period with little crying, little movement, poor sucking ability, abdominal distention, constipation, prolonged physiological jaundice, low body temperature, cold extremities, and low response to the outside world. 2. Typical facial features: large head, short neck, pale yellow face, puffy eyelids, wide eye spacing, low nasal bridge, large and wide tongue, often sticking out of the mouth. 3. Short stature, slowed or even stagnant growth, long trunk and short limbs. 4. Indifferent expression, slow reaction, poor academic performance. 5.Heart rate is slow, and anemia is not easily corrected. Fatigue and weakness, stagnant growth of bones and teeth in older children. School-age children develop learning disabilities and prolonged puberty. Female adolescents may develop menstrual disorders. Thyroid function by blood test and hand . Wrist . (knee for infants) to determine whether the child has funky hypothyroidism and the severity of the condition. The aim of treatment is to replace the lack of thyroxine in the body. The drug, as in adults, is levothyroxine – a synthetic thyroid hormone. However, the dose of treatment is matched to the child’s weight and individuality.