How to treat the very hypoechoic nodule under the left lobe of the thyroid gland needs to take into account the nature, location and size of the nodule. Extremely hypoechoic nodule under the left lobe of the thyroid gland may be thyroid cancer and other diseases, if the diagnosis of thyroid cancer is clear, surgical treatment can be taken, such as thyroid cavity surgery, open surgery. Thyroid nodule echogenicity generally means that the solid component of the nodule is equivalent to the echogenic level of the thyroid parenchyma and the cervical strap muscles. Extremely hypoechoic means that the echo is below the level of the cervical strap muscles. Hypoechoic or very hypoechoic is generally considered to be an ultrasound sign of suspected malignancy. When patients are found to have extremely hypoechoic nodules under the left lobe of the thyroid gland, it is recommended that they consult a doctor in a timely manner, and after completing the relevant examinations, take symptomatic treatment according to the nature of the nodule as prescribed by the doctor.