The time of discharge after accidentally swallowing an iron piece depends on the size of the area of the swallowed iron piece and whether the shape is rounded, if the iron piece is relatively large and the surface of the iron piece is not smooth, it will cause damage to the digestive tract or even life-threatening. It is recommended to go to the hospital to take pictures and check, and if necessary, surgical treatment. If the swallowed iron piece is relatively small and has a smooth surface, you can visit a doctor for advice. Such iron tablets may be eliminated through the intestines, which takes about 12 hours. In order to speed up the expulsion and avoid damage to the digestive tract, you can eat more fiber-rich foods, such as bananas, sweet potatoes, beans, etc., which will form a wrapping around the iron tablets to prevent them from scratching the digestive tract and protect it. At the same time, drink more water, more exercise, promote gastrointestinal peristalsis speed is conducive to early discharge of iron tablets.