Stools with loose threads may be caused by dietary factors, indigestion, intestinal infections and so on. 1. Dietary factors: it may be due to excessive intake of fiber-containing foods, such as spinach, oilseed rape, cabbage, etc., due to the mixing of food fibers in the stool, so there will be a filament. 2. Indigestion: It may be caused by eating too much greasy food or overeating, which leads to the phenomenon that food stays in the gastrointestinal tract for a long time, cannot be fully digested and excreted with the stool, and is often accompanied by nausea, loss of appetite, abdominal distension and other symptoms. 3. Intestinal infections: For example, viral or bacterial infections can lead to more white blood cells or pus cells in the stool, especially in severe infections, not only will there be loose stool, there may be pus. There may be other reasons for having loose stool, if you exclude physiological reasons, you can go to the hospital, cooperate with the doctor to take examination, clear diagnosis and then treatment.