Tears may be caused by emotional reaction and increased secretion of lacrimal gland in comatose people. 1. Emotional reaction: the patient’s coma is shallow, the center of the brain controlling emotions is not affected, or consciousness has been restored, and emotional reactions such as sadness can occur when stimulated by the outside world, resulting in the phenomenon of tears. 2. Increased tear secretion: When the parasympathetic nerves are excited, the tear secretion increases, resulting in the flow of tears, and there is no change in mood, nor does it mean that consciousness is restored. Coma belongs to a kind of continuous unconscious state, which is mainly manifested by continuous interruption or complete loss of consciousness, and it is difficult to wake up, and the correct care and concern of medical personnel as well as family members can help the recovery of the condition. Comatose patients with tearing should complete the relevant examinations under the guidance of the doctor, to clarify the cause of the disease, and actively cooperate with the treatment, do not diagnose and treat on your own, so as to avoid delaying the condition.