Acute cystitis is a common infectious disease of the urinary system, which is an infectious disease caused by the infection of the bladder mucosa with bacteria such as Escherichia coli, Staphylococcus aureus, Streptococcus, Pseudomonas aeruginosa, Clostridium perfringens, Clostridium perfringens and other bacteria, such as urinary frequency, urinary urgency, painful urination, hematuria, small abdominal pain and fever. The main cause of acute cystitis is caused by retrograde bacterial infection, mainly caused by bacteria entering the bladder through the urethra. The main reason for this is that women have a short, wide and straight urethra, which makes them more likely to develop cystitis after sex or if they have a vaginal infection. Certain medical procedures can also lead to acute cystitis, such as cystoscopy and catheterization, if they are not performed with strict asepsis. If the above symptoms occur, you need to go to the hospital for urine routine and urinary ultrasound examination, and if necessary, urine culture and drug sensitivity test, and then choose sensitive antibiotics for treatment according to the drug sensitivity results, and at the same time, you need to pay attention to drink more water and urinate more often, relying on the flushing effect of urine to discharge bacteria and inflammatory exudates out of the body. Pay attention to a light diet, abstain from spicy and stimulating foods, and prohibit sexual intercourse. As mentioned above, acute cystitis is an infectious disease with an acute onset and heavy symptoms that requires timely treatment.