Whether a urinary catheter is needed for thyroidectomy surgery depends on the situation and is related to the condition and the duration of the surgery. A urinary catheter is required for general anesthesia, and can be left in place for shorter procedures. Thyroidectomy is usually performed under general anesthesia. Because the bladder of general anesthesia patients does not have the function of independent urination, the operation time is too long, which will lead to the accumulation of urine produced by the kidneys inside the bladder, resulting in urinary retention, so a urinary catheter should be inserted before the operation, in order to let the urine flow out by itself. Moreover, after general anesthesia surgery, patients will also have a period of coma, bladder function can not be recovered in a timely manner, and in serious cases, there is a risk of bladder rupture, so it is recommended to insert a urinary catheter before surgery. There are some patients with thyroid disease only one side of the lesion, and the disease is in the early stage, the operation is relatively less difficult, experienced surgeons operating time will be very short, part of the operation can be done in 20 ~ 30 minutes, this shorter operation can not insert a urinary catheter.