Hi..im 23 yrs old and i was just wondering what might be the cause of this pain in my lower left rib. I just woke one morning and felt a little pain on my left side whenever i take a deep breath. Then a day after i noticed my left rib protruding. im a bit scared what might cause the pain. And by the way i also experience back pains sometimes particularly on the left. i just hope i can get an answer to this. Thank you!