Overactive bladder syndrome (OAB) is a urological condition when your bladder contracts and it isn't quite full.
"It is a common condition where no cause can be found for the repeated and uncontrolled bladder contractions," says Patient.co.uk.
"In people with an overactive bladder, the bladder muscle seems to give wrong messages to the brain. The bladder may feel fuller than it actually is. The bladder contracts too early when it is not very full, and not when you want it to. This can make you suddenly need the toilet. In effect, you have much less control over when your bladder contracts to pass urine."
Healthline adds: "If you have an overactive bladder, you probably experience an intense, urgent, overwhelming need to urinate. Perhaps it’s so sudden that you have trouble making it to the bathroom in time.
"This symptom can occur at any time of day, regardless of where you are and what you’ve had to drink. It can happen if you’ve had nothing to drink for hours. It can even happen after you’ve already emptied your bladder."
Writing on HuffPost Healthy Living, Mache Seibel writes that it can be a form of 'urge incontinence' and that while it can be embarrassing, millions of people have it.
His tips include bladder training, Kegel exercises and surgery, including injections of Botox into the bladder muscle.