Frequent urination can be caused by diabetes, urinary tract infections, interstitial cystitis, neurological problems or overactive bladder syndrome, according to WebMD. In men, prostate disorders can also increase the frequency of urination because of the resulting irritation of the bladder wall. Women sometimes experience more frequent urination during pregnancy.
Some people only suffer from frequent urination at night, which is called nocturia, as reported by MedlinePlus. Lifestyle habits or changes can also cause people to urinate more often, such as increasing the intake of caffeine or alcohol. Less common causes of frequent urination include bladder cancer, stroke or pelvic tumor. People who suffer from this condition for extended periods of time should consult a physician.