Double chin and goiter occur for different reasons and have very different morphologic manifestations and locations, which can be differentiated by medical examination. Double chin is a superficial morphology, whereas goiter is an enlargement of an endocrine gland, the thyroid gland. Both double chin and goiter occur near the neck, so it may be possible to confuse double chin and goiter, but there is a big difference between these two morphologies. Double chin occurs most often in obese people, which manifests itself as more fat in the jaw and shows a drooping sensation underneath the chin, which is mainly due to excessive body fat. While goiter is due to abnormal secretion of thyroid hormone, which can occur in hyperthyroidism or hypothyroidism, the enlargement occurs near the laryngeal node area, which can be diagnosed by palpation examination of the thyroid gland as well as ultrasound of the thyroid gland. If you find abnormalities in the neck, you can go to the hospital to improve the thyroid ultrasound and other related examinations, to clarify the cause of the disease, and standardize the treatment under the guidance of the doctor.