Cyst pain is often caused by a combination of the following reasons: first, caused by pulling, when the cyst grows gradually, the nerves on the surface of the cyst are not able to become longer, the nerves on the surface will be pulled causing pain, the larger the cyst the richer the nerves are, the more intense the pain will be. Secondly, cyst rupture, when the cyst has fluid extravasation, the peculiarity of its composition will stimulate the surrounding tissues, and it will cause pain. Third, cyst infection, when the cyst fluid accumulates for too long, it will cause infection in the cyst, and the infected fluid will stimulate the body to produce many histamine, leukotriene and other inflammatory media, which will cause pain when it is brought together locally. Fourth, extrusion factors, when the cyst is larger, it will squeeze the surrounding tissues or organs, which will also cause pain.