The answer to 'why is my switch hot to touch' is that a hot switch is usually a sign of an electrical problem that needs immediate attention. This can be caused by a loose connection, faulty wiring, or an overloaded circuit. The switch may feel warm or hot to the touch, and you may also notice flickering lights or other electrical issues.
If your switch is hot, it's important to turn off the power to that circuit right away and avoid touching the switch until it has been inspected and repaired by a licensed electrician. Attempting to fix the issue yourself can be extremely dangerous and may result in further damage or even electrical shock. A professional electrician will be able to diagnose the root cause and make the necessary repairs safely.