Don't throw out that letter from your credit card company. It may be notifying you of a reeled in credit line, interest rate hike or even an account closure.

In this recessionary climate, credit card companies across the board are tightening the reins on card holders to minimize their exposure to risk. Such actions could hurt your credit score and, in turn, your ability to get an auto loan, mortgage or even another credit card. So heading into the holiday shopping season, make sure you're aware of any changes to your credit card terms.

In coming weeks, for instance, American Express is instituting a broad-based interest rate hike of 2 to 3 percentage points on card holders. The hikes are the result of an expected rise in charge-offs, or balances written off as not being paid, the company said earlier this month.

Across the industry, credit card charge-off rates rose to 6.8 percent in August, a 48 percent jump from the same period last year. According to Moody's Investors Service, it was the 20th consecutive year-over-year increase.

Moody's expects charge-offs across the industry to continue rising into next year, eventually surpassing peak rates seen during past recessions.

Further pressuring credit card companies are new industry regulations set to be adopted by the Federal Reserve later this year. One proposed regulation, for instance, would ban credit card companies from raising interest rates on existing balances.

"The new regulations are going to hamstring (card companies') ability to manage accounts the way they have in the past," said John Ulzheimer, president of consumer education for Credit.com.

To protect your credit score through these times, keep these points in mind.

Even if you're not doing anything differently, lenders may be clamping down on your account. That's because credit card companies are re-evaluating their criteria, said Carol Kaplan, a spokeswoman for the American Bankers Association, an industry group.

In a robust economy, for instance, a $15,000 balance may not have triggered any alarms. Today, it may be reason for a higher rate or a lower credit line, Kaplan said.

Other reasons lenders may tweak terms include late payments, partial payments, exceeding credit limits - even if such behavior didn't provoke changes before.

Not using your card often enough could also be cause for a change or even prompt the company to close the account.

"The bottom line is, card issuers are looking for a reason to say no. They're going on defense and minimizing their exposure to risk," said Greg McBride, senior analyst at Bankrate.com.

New regulations

Credit card companies may also be changing terms to gird for new regulations set to be adopted by year's end.

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