35-year-old female felt unusual tiredness a few months after giving birth, she gained weight and felt pain all over her body, paresthesias in her hands, and loss of energy. Examination revealed diffusely enlarged thyroid gland, the patient was clinically hypothyroid, and levothyroxine was prescribed. In the expert's opinion, the high TSH and low levels of T3 and T4 suggests the patient most likely suffers from Hashimotos thyroiditis and replacement with thyroid hormone can be a solution for her condition.