Frequent urination is defined as urinating more often than what you consider normal. It can be a simple annoyance or a sign of a serious medical issue. [1] [2] Most people can sleep through the night without having to urinate or only need to get up once to use the bathroom. People who have to get up multiple times at night may have a condition called nocturia.Adults who pass more than 3 cups to 3 quarts (700 milliliters to 3 liters) of urine in a day may have a condition known as polyuria. If you have concerns about how often and how much you urinate, talk to your doctor.