What was it??? any ideas?

for the last 2 weeks, i had a pain in the right side of my chest ... it felt like a stitch, but got worse when ii took a deep breath or yawned .. kinda like sharp stabbing pains ... but today, i hiccupped, felt a popping sensation where the pain was, then it dissappeared ... it doesnt hurt at all anymore.. anyone have any idea as to what it could have been??