Girls with thick necks, there are four common causes, as follows: 1, hyperthyroidism: if hyperthyroidism caused by neck enlargement, usually accompanied by panic, hand tremors, protruding eyeballs, or blurred vision when looking at things, photophobia, tearing, at the same time, you will feel palpitations, neck thickening to improve the thyroid function of the triple test, the thyroid ultrasound examination.2, thyroid nodules: check the thyroid ultrasound, to clarify the nature of the nodules, including the benign, The doctor will classify the nodules according to the ultrasound, and consider surgery if they are stage IV.3. Simple neck enlargement: this condition does not need special treatment.4. Lymph node enlargement: consider it caused by lymphadenitis, which is usually not necessary to deal with.