The phrase "stinging pain" often describes nerve pain, so it may be that something is pressing on a nerve. If today is the first time this has happened, you could watch to see if it goes away by itself. A pulled muscle or pinched nerve might improve on its own. However, if the pain persists, you'll want to see a doctor. I hope you soon feel better, but if not be proactive about finding out what is going on. This article on breast pain can help you evaluate your pain.
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