Esophageal cancer is esophageal cancer, and low urination after esophageal cancer surgery may be caused by urinary retention or insufficient fluid intake. 1. Urinary retention: Since esophageal cancer patients need to use anesthesia drugs during surgery, if the anesthesia drugs in the body are not completely metabolized after surgery, and still paralyze the bladder sphincter and inhibit the nervous system of urination, then urinary retention will be complicated. When the bladder is overfilled to its limit, a small amount of urine will involuntarily overflow from the urethra. It usually recovers on its own within a short period of time. 2. Insufficient liquid intake: patients need to fast for food and drink before operation, if they do not supplement liquid in time after operation, some patients will have low urine output after esophageal cancer surgery, which can be recovered after proper supplementation of liquid. To sum up, there are many reasons leading to low urine output after esophageal cancer surgery, which can be relieved by themselves in most cases, so there is no need to worry too much. In most cases, it can be relieved on its own and there is no need to worry too much. If the symptoms are serious, it is necessary to cooperate with doctors to improve relevant examinations to clarify the specific causes and take treatment measures if necessary.