Some MacBook owners get a cooling pad and rely on the accessory to manage the issue. It is a decent approach, but it might not be enough to solve the problem for good. The odds are that there is too much dust inside the laptop, and unless you clean it regularly, it will continue to snowball out of control.
Unless you know how to take the MacBook apart to clean it thoroughly, it is better to leave the task to someone with experience. You will need to pay money for the job, but at least there will be minimal risks involved when a professional is cleaning the device