The answer to 'why is my recessed lighting' is that there are several common causes, including bulb failure, wiring issues, or problems with the recessed light fixture itself. Symptoms may include the light not turning on, flickering, or dimming. Solutions can range from simply replacing the bulb to more complex electrical repairs.
If the issue is a failed bulb, this is an easy DIY fix - just replace the bulb with the correct type and wattage. However, if the problem is with the wiring or the fixture itself, it's best to call in a licensed electrician. Attempting electrical repairs without proper training and safety precautions can be dangerous.