The answer to 'toilet overflowing' is that there are several common causes, including a clogged drain, a malfunctioning toilet flapper, or a problem with the toilet's water level. Symptoms can include water spilling over the toilet bowl and potentially causing water damage to the surrounding area.
Some potential solutions include using a plunger to try to clear the clog, adjusting the toilet flapper or water level, or plunging the toilet. However, if the problem persists or you're not comfortable troubleshooting it yourself, it's best to call a professional plumber to diagnose and fix the issue.