The entry of metal foreign bodies into the body is not a small problem, must pay sufficient attention. Different metal foreign body retained in the body can cause many reactions and hazards to the human body, what are the specific hazards? Metal foreign body in the body is not removed seven major hazards a, life-threatening heart trauma residual metal foreign body, not only can cause fatal hemorrhage or heart pressure plug, and the location of the foreign body is easy to change, resulting in unpredictable consequences. Therefore, the diagnosis, timing of surgery and selection of surgical methods for metal foreign bodies in the heart are difficult and different from those for heart trauma without foreign bodies. Infection is a very common complication of metallic foreign bodies that cause infection in the body. Bacterial metal can bring bacteria into the body, due to the inactivation of the tissue around the metal foreign body, the resistance is reduced, and the liquefaction of the necrotic tissue provides a good living environment for bacteria, so the bacteria survive and increase in value, further causing infection. This rapidly changing cavity not only causes further damage to the surrounding tissues, but the negative pressure in the cavity also draws bacteria from the surrounding environment into the body. High-speed, rotating bullets can also cause areas of tissue necrosis much larger than the diameter of the bullet, thus making the infection caused by firearm injuries more serious. Third, dysfunction The metal foreign body in the skull, brain and spinal cord can compress different functional areas and cause corresponding function reduction or loss. Foreign bodies in the joints can cause dysfunction of the affected joints. Allergic and rejection reactions after implantation of sterile orthopedic implants can cause redness, swelling, itchiness and other uncomfortable reactions of varying severity. When the author removed the internal fixation in such patients, he found that some patients had liquefied tissue around the internal fixation, black and brown-like discoloration, pathology showed connective tissue hyperplasia, acute and chronic inflammation with tissue degeneration. Large areas of tissue necrosis and sometimes calcium salt deposits are seen, with more lymphocytes, plasma cells, and mononuclear-like cells scattered around the edges of the necrotic tissue, and more macrophages and multinucleated giant cells scattered around the edges of the necrotic tissue and granuloma formation. However, the rejection of metal foreign body also has a beneficial side for human, such as gynecology use the rejection of metal foreign body to place the birth control ring into the endometrium to achieve the purpose of contraception. Fifth, metal poisoning Metal foreign body (including metal endophytes) into the human body, metal ions will enter the blood system through the surrounding tissues, causing abnormalities in the blood metal ions or the accumulation of a certain organ. Nickel-titanium alloy is a more common endophyte in the early stage of orthopedics, and although the problem of histocompatibility is solved, animal experiments have shown that changes in nickel content in the nasopharyngeal mucosa, kidney, liver, spleen and overall after the placement of nickel-titanium alloy have shown an increase with time. The relationship between nickel and nasopharyngeal cancer has been confirmed by many studies, but the correlation between nickel-titanium alloy endosseous placement and nasopharyngeal cancer needs to be further studied in depth. Firearm metallic foreign bodies are mostly made of copper, lead, aluminum, and steel. Studies have confirmed that blood lead concentration after firearm injury increases with the prolongation of warhead left behind, and shrapnel and bullets left inside the body after gunshot wound cause arthritis, constipation, abdominal pain and weight loss due to chronic lead poisoning, and can even cause erectile dysfunction. Studies have shown that copper and lead planted in the subdural, especially copper can cause damage to the dorsal horn axons and myelin sheath of the spinal cord. Sixth, mobile, embolism metal foreign body into the body, if into the large blood vessels, cavity organs such as gas, esophagus, urethra, it can travel with the pipeline, and finally embolism of the corresponding organs leading to respiratory distress, hemoptysis, blood in urine, urinary retention and other symptoms, if embolism to the large blood vessels of the lower limbs will also cause amputation. VII. Psychological disorders Recent follow-ups of patients with internal fixation of fractures have shown that the retention of metal foreign bodies in the body can cause varying degrees of mental stress, especially when the weather changes, patients will have varying degrees of aches and pains. In some religious countries, it is not acceptable to be buried with internal fixation after death. In most cases it is necessary to remove the metal foreign body from the body, which is located at different depths on the surface of the body, so accurate positioning is the first requirement for removal. If you have any other questions, please click on the online consultation button and our experts will give you patient answers.