An uncontrollable desire to urinate. In a bladder infection, the bladder becomes extremely constricted and can hold only a minimal amount of urine. This puts pressure on the bladder, making the urge to urinate uncontrollably. While a healthy person may be able to resist this urge for a small period (not that this is a good thing to do), a person suffering from an infection of the bladder finds that they must go at once. Another indicator of a bladder infection is passing only minute quantities of urine and feeling the urge again almost immediately.