Anatomically, there is no such condition as a ‘small bladder’, but functionally it can definitely feel like that.
In healthy bladders, the initial urge to urinate is often mild and can be ignored, resulting in the need receding when the bladder stretches past a certain point. The urge will then return more strongly when the bladder is nearing capacity and needs to be emptied.
An overactive bladder is overly sensitive, meaning that initial urge can’t be ignored; the sensation is urgent and the ability to ‘hold on’ just isn’t there, which leads to leakage and even full bladder loss before getting to a toilet. This is Urge Incontinence.
Improving an overactive bladder should be managed by an appropriate health care professional. Medication maybe required.