The common clinical causes of wetness at the tailbone are mainly the following: a. The patient’s tailbone is accompanied by a large number of sweat gland distribution, once excessive exercise causes a large number of sweat gland excretion, thus causing dampness in the tailbone. It is recommended that patients change their clothes as soon as possible to maintain a dry environment at the tailbone to avoid repeated dampness causing dampness to invade the body, resulting in symptoms of cold in patients. Second, for patients with cerebral hemorrhage and cerebral infarction, as patients lose their normal mobility, they are not able to urinate and defecate on their own and need to wear diapers for a long time, which also causes the perineum to be significantly less breathable. Due to the moist environment at the coccyx caused by the stimulation of large amounts of fecal urine, patients may even develop eczema and pressure sores locally, which can cause serious infectious complications.