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Overactive bladder (OAB) symptoms can have various causes:

  • Some people experience sudden and spontaneous contractions of the bladder muscle
  • Some people are more sensitive to the feeling of their bladder filling
  • In some cases, the kidneys produce too much urine at night, which causes nocturia. This may be related to older age or certain medical conditions
  • Some people have a smaller bladder which is filled to capacity more quickly, but this is not very common