The answer to 'why is my garbage disposal constantly running' is that the disposal is likely jammed or has a malfunctioning switch. A constantly running disposal is often caused by a foreign object stuck in the blades, a faulty switch, or a problem with the motor. This can lead to the disposal running continuously, even when no food is being processed.
Some common symptoms include a loud, grinding noise, the disposal not turning off when you flip the switch, or the motor feeling hot to the touch. In most cases, the issue can be resolved with a simple DIY fix, but if the problem persists, it's best to call a professional plumber to diagnose and repair the disposal.