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 deceased hanged 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, incontinence, basic death, has been difficult to rescue. It is mainly based on the history of hanging (self-hanging). Differential diagnosis should be made with the following symptoms: 1, tongue ptosis Tongue ptosis is one of the symptoms of pediatric micrognathia syndrome. 2, tongue protrusion dementia Mouth and tongue protrusion dementia is one of the symptoms of pediatric micrognathia syndrome. 2, tongue protrusion-like dementia The mouth is half-open, and the tongue is often protruding out of the mouth, salivating symptoms. The main thing for self-strangulation behavior is to do a good job of psychological guidance to prevent mental, psychological and behavioral disorders.