Cystitis is an inflammatory condition that occurs in the bladder and is caused primarily by specific and nonspecific bacteria colonizing the bladder and forming an infection, as well as other specific types of cystitis. Cystitis is more common in clinical practice and is more likely to develop in women. In addition lifestyle and urinary tract obstruction can also cause cystitis. 1, bacterial infection: is the most common cause, can be divided into specific infection and non-specific infection. The specific infection refers to tuberculosis of the bladder. Non-specific cystitis is caused by Escherichia coli, E. coli, E. parapsilosis, E. deformans, Pseudomonas aeruginosa, Streptococcus faecalis and Staphylococcus aureus, with E. coli infection being the main cause of retrograde infection on the basis of urinary tract infection. For example, secondary to urethritis, prostatitis in men, gynecological diseases in women. 2, irregular lifestyle, do not pay attention to personal hygiene, often stay up late and work overtime, the diet is spicy, while drinking less water, do not like to eat vegetables. The habit of smoking and drinking will have an impact on cystitis. 3, obstruction of the urinary tract, such as stones, urinary tract strictures, tumors resulting in the accumulation of urine in the bladder, causing bacteria to multiply, leading to cystitis. Due to the repeated insertion and removal of the ureter caused by prostate enlargement, it is easy to cause damage to the bladder mucosa, leading to inflammation. 4, many people have to hold urine for a long time because of their work.