The condition which we describe under this head commonly causes frequent painful urination. Primarily there is usually some agency which mechanically or chemically irritates the bladder, and if the irritation does not subside, inflammation follows owing to the entrance of germs in some manner. The introduction into the bladder of unboiled, and therefore unclean, instruments is a cause; another cause is failure to pass urine for a long period, from a feeling of delicacy in some persons when in unfavorable surroundings. Nervous spasm of the urinary passage from pain, injuries, and surgical operations constitutes another cause. Inflammation may extend from neighboring parts and attack the bladder, as in gonorrhea, and in various inflammations of the sexual organs of women, as in childbed infection. Certain foods, waters, and drinks, as alcohol in large amounts, and drugs, as turpentine or cantharides applied externally or given internally, may lead to irritation of the bladder. Exposure to cold in susceptible persons is frequently a source of cystitis, as well as external blows and injuries. The foregoing causes are apt to bring on sudden or acute attacks of bladder trouble, but often the disease comes on slowly and is continuous or chronic.
