Patients with hypothyroidism during pregnancy can consume kelp in moderation, but not in excess, while consumption of kelp can not replace medication for hypothyroidism in pregnancy. Hypothyroidism in pregnancy is an endocrine disease with generalized hypometabolism caused by decreased synthesis and secretion of thyroid hormones. Untreated hypothyroidism can lead to miscarriage, death, growth restriction and mental retardation of the fetus. Kelp as iodine-rich seafood, patients with hypothyroidism during pregnancy moderate consumption of kelp has certain benefits, but should not be excessive, so as not to aggravate the burden on the thyroid gland. Patients with hypothyroidism during pregnancy can benefit from taking kelp in moderation, but the effect cannot be equated with medication, so it is recommended to have a reasonable diet, monitor thyroid function regularly, and carry out regular treatment under the guidance of a doctor.