My left thigh has been numb all day what could it be?

Form of paresthesia: Any unusual sensation, variously described as numbness, burning, tingling, ants crawling under skin, can be considered 'paresthetic'. Can occur anyplace, vast majority r transient, curious, then gone. If persistent & spreading or other sx start, consider neurolgic, such as peripheral neuropathy, compression of a nerve.What u r describing could turn out 2 b lateral femoral cutaneous syndrome-:).

Meralgia: Meralgia paresthetica is a condition characterized by tingling, numbness and burning pain in the outer part of your thigh. The cause of meralgia paresthetica is compression of the nerve that supplies sensation to the skin surface of your thigh.