In Chinese medical theory this makes a certain amount of sense. Pain is caused by our Qi not flowing smoothly. Stress is caused by our Liver Qi not moving properly (Liver being related to the emotion of anger or frustration). Swearing can help release our Liver Qi, freeing it. Perhaps swearing also has an effect on not just our Liver Qi, but all of the Qi in our body. Free Qi movement equals reduced pain!
So, if you bang your thumb with a hammer, or are a pregnant woman going through labor, feel free to mutter (or scream!) that favorite curse word. You'll feel better for it!
*I'd like to apologize for the lack of posts lately, the kiddo has ceased taking naps recently, making me reconfigure our schedule and trying to figure out when to get some writing done. I hope to get back on the writing wagon now that things have settled down a bit! Thanks for being patient with us!