The clinical manifestations of strangulation include mild exsanguination of the tongue. Strangulation (strangulation) or strangulation, common for hanging (suicidal hanging), mostly due to psycho-emotional factors, or in psychiatric patients with delusions and other symptoms. Suicidal hanging can cause serious damage to the brain and organs of the whole body. However, due to the thickness of the rope, the gravity of the body and the length of time, the degree of damage is different. Rope and other objects compression of the neck can make the respiratory tract closed and cause asphyxiation death. Hanging people once suspended, due to the relationship between the position, the rope more compression in the hyoid bone and thyroid cartilage between, and due to the relationship between the weight of the tongue is pressed to the back of the upper part of the back wall of the pharynx and soft palate back end of the contact, so that the respiratory tract partially or completely occluded, the air can not be unobstructed, the lungs respiration can not be carried out normally and asphyxia occurs. Some studies have shown that the neck is subjected to 15 kilograms of pressure, it is enough to press the respiratory tract closed. The constricted person hangs himself for a short time, the clinical manifestations of cyanosis, eyes upturned, tongue mild vomiting, respiratory arrest, weak heartbeat and has been confused; heavy not only respiratory arrest, pulse and heartbeat disappeared, limbs become cold, urinary and fecal incontinence, the basic death, has been difficult to rescue. Should be differential diagnosis with the following symptoms: 1, tongue ptosis tongue ptosis is one of the symptoms of pediatric micrognathia syndrome. The root of the tongue is normally supported by the traction of the mandibuloglossus muscle of the mandibular-chin union, so it can be in the anterior position. When the root of the tongue loses its support in the case of maxillary posterior displacement deformity, it becomes retroverted, and the oropharyngeal isthmus is narrowed and blocked, which leads to airway obstruction. Due to airway obstruction, breastfeeding obstruction, the child may appear compensatory to strengthen the inspiratory action and sucking force, which makes the hypopharynx, thoracic esophagus, negative pressure increases, forcing the tongue root more backward drooping. At the same time, a large amount of air enters the stomach, which can cause regurgitation. Vomit capacity is inhaled into the lower respiratory tract, resulting in aspiration pneumonia or pulmonary atelectasis. 2, tongue-like dementia The mouth is half-open, and the tongue often sticks out of the mouth and salivates. Also known as congenital stupidity, trisomy 21, is the most common chromosomal disease caused by autosomal aberrations. Clinically, it is characterized by mental retardation, special facial features or accompanied by other malformations. The mouth is half-open, the tongue is large and often sticks out of the mouth, and the symptoms of salivation.