NFKB1 and interstitial cystitis: This study demonstrated that miR‐9‐enreched MSCs derived exosomes alleviate neuroinflammaiton and cystitis‐induced bladder pain by inhibiting TLR4/NF‐κb/NLRP3 signal pathway in interstitial cystitis mice, which is a promising strategy against cystitis‐induced bladder pain.