Strictly speaking, the term "irritable bladder" refers only to situations of disturbingly frequent urination for which no other causes can be found. In irritable bladder, the function of the urinary bladder is disturbed. This means that those affected feel the need to urinate much more often than would be physically necessary. In addition, there may also be involuntary loss of urine.
A constant urge to urinate or incontinence can occur with many diseases. These include, for example, sexually transmitted diseases, neurological diseases, narrowing of the bladder outlet, tumor diseases, mental illnesses, or chronic bladder inflammation (interstitial cystitis).