Instant pins and needles pain under the left rib cage may be intercostal nerve pain, this kind of nerve pain is like pins and needles, electric shock, may be when whoosh a few times, it is spontaneous pain, may be when whoosh a few times again, not yet reacted to it does not hurt, may be when it is two times again. This situation is mostly seen in the intercostal nerve, can be inflammatory, viral infections, such as herpes zoster virus infection; can also be due to the intercostal nerve by the bone, such as the small femoral joint interlocking, or osteophytes compression to the ribs of the intercostal nerve, may appear this kind of pain. You need to look for the cause of this pain, and the first thing you can do to stop the pain is to take medication such as carbamazepine, gabapentin, or pregabalin to treat it. If the pain lasts for a week or so and there are herpes-like changes in the skin in the area of 2-3 neighboring nerves, this is shingles, and antiviral treatment is needed.