<s>[INST] I am a 54 year old male, in otherwise very good health. I had lower back pain for about a week and it has mostly subsided (almost completely). On day five I noticed a numbness on my lower abdomen, left side, around the bikini line. The ER doctor said it was nothing to worry about. The numbness is still there along with a low level of pain. Any ideas of what if might be? [/INST] This does not sound like anything serious. There can be irritation of nerves that supply the anterior abdominal area, and these are likely to be superficial nerves. It should likely resolve in a few days. </s>