Catheterization is a method of inserting a catheter into the bladder through the urethra to draw out bladder urine, and is a commonly used clinical examination and treatment. Enema is to instill a certain amount of liquid into the colon through the anus to achieve the purpose of cleansing the intestines, promoting defecation and exhaustion and intestinal drug administration. 1. Catheterization is used to relieve urinary retention, bladder drug irrigation and flushing for bladder inflammation. Urethrogram or cystography, retention of uncontaminated urine specimens for examination and other routine tests also need to perform catheterization. Catheterization of critically ill comatose patients facilitates detailed recording of 24h urine output, helping doctors to understand the vital signs and conditions. Prenatal and surgical routine catheterization to facilitate intraoperative disposal and postoperative care. 2. Enema can be divided into retained enema and non-retained enema, is through the anus will be a certain amount of liquid enema into the colon, to achieve the purpose of intestinal cleansing, promote defecation and excretion and intestinal drug delivery. Such as reduced peristalsis, constipation, sigmoidoscopy or preoperative bowel preparation, can be used without retention enema to clean the bowel, promote peristalsis and defecation. Retained enemas are indicated for trans-intestinal administration of commonly used drugs, including saline procaine solution and chloral hydrate. Patients with hyperthermia can also be cooled by instillation of hypothermic fluids. Both catheterization and enema should be performed by professional medical personnel. If you need catheterization and enema, please consult a regular hospital.