Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Team Health Holdings (NYSE: TMH) rose more than 12% on heavy volume in early trading Wednesday for no apparent reason. Shocking.

So what: File this one under the "proof Mr. Market is the lunatic on the corner who shouts at the rain for stealing his balloons" file. How do we know there isn't more at work here? We don't, really, but I think it's telling that the stock had pulled back to being up less than 1% as of this writing.

Now what: In cases like these, there's usually some odd rumor or persistent innuendo driving the stock price to unreasonable levels. Here, it's probably more of the same momentum trading that sent the stock soaring three weeks ago.

My advice? Ignore the swings. Take a closer look at competitor MEDNAX (NYSE: MD) instead. Unlike Team Health, the stock trades for a discount to the long-term earnings growth that analysts expect.

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Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team. He didn't own shares in any of the companies mentioned in this article at the time of publication. Check out Tim's portfolio holdings and Foolish writings, or connect with him on Twitter as @milehighfool. You can also get his insights delivered directly to your RSS reader. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool is also on Twitter as @TheMotleyFool. Its disclosure policy is at least 10% better than other disclosure policies.