This is a very late posting, i sneezed just before Easter "04.04.2019" and had instant unbearable pain. After see my GP 3 times he kept saying the same thing "you have pulled a muscle and it could take up to 6 month to heal". On my 4th visit i demanded a x-ray.....the x-ray revealed a shadow on my Lung. I gave just been diagnosed with lung cancer along with a secondary spinal tumour. I am not saying that all rib pain is caused by sneezing but to be on the safe side please go to your GP and ask him to send you for an x-ray if he tries to brush you off then DEMAND that he sends you.