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Stress and Depression

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While it isn't true that suicides increase over the holiday season, that doesn't mean that everyone is walking around being jolly. The good news is that suicides appear to go down around Christmastime. However, while you might be less likely to kill yourself, you are more likely to kill someone else, with murder rates increasing in many Western countries during the month of December, including by almost 6 percent in the U.S. So, obviously, there must be something about the holidays that is making people snap.

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According to a Consumer Reports poll, 90 percent of people have at least one thing that gets them down or stresses them out over the holidays. Some of the major things that annoy people are obvious, like crowds and traveling, but every year millions of people are also driven to distraction by Christmas music and "having to be nice," because apparently that lie about Santa watching you that your parents told you as a child sticks around well into adulthood. Another poll found that the financial pressure of Christmas is so intense that 45 percent of people would rather skip the holiday than deal with the bills.

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Weight Gain and High Blood Pressure

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Everyone expects to gain a pound or two around the holidays, but what is shocking is just how badly and how quickly you can become unhealthy. Boxing Day is one of the most dangerous days of the year for people with heart problems, and after the amount you eat and drink on Christmas, you just might fall in that category.

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One study in Britain found that people eat their daily recommended calorie intake by 2 p.m. on Christmas Day. You might recognize 2 p.m. as before you even really start eating. By the end of the day, expect to consume 7,000 calories. This might be why people gain an average of 6 pounds in the nine days between Christmas Eve and New Year's.

And that doesn't even begin to include the leftovers ... or the alcohol. Drinking increases over 40 percent in the U.K. and almost 30 percent in the U.S. over the holidays. All this unhealthy food and drink can increase your blood pressure, and the added stress can combine to make the perfect storm for a heart attack -- the number of heart-related deaths increases by 5 percent over the holidays.

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2

Traffic Accidents

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Take a sneezing, depressed, stressed out, unwell person and sit him behind the wheel of a deadly weapon. Then put him on a road with hundreds of other people who are also unhappy and unhealthy. What you get are some of the worst driving days of the year.

Obviously, there is the fact that the weather gets worse around Christmas, with snow and rain making driving more dangerous. And there are more people on the road than normal, which also leads to more accidents. But the thing that can really turn a silent night into a deadly night is the fact that people are assholes.

Sure, you probably can't take out all your holiday anger on your family without ruining Christmas, but you can scream at the guy who cut you off to your heart's content. Just keep in mind that there will be repercussions. Thanks to the fact that 32 percent of drivers become more aggressive around the holidays, the number of accidents increases almost 20 percent in the month of December, and that doesn't even include the fender benders in crowded parking lots that aren't reported.

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1

Decorations

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Just about everything you put up around your house for the holidays is ready to hurt you. Sure, those heirloom glass ornaments are beautiful, until one falls off the tree and you step on it with your bare feet. Cheap Christmas lights result in a shocking (booooo) number of electrocutions. And being on a ladder is dangerous at the best of times, even more so when you've been indulging in some eggnog and you refuse to take 10 seconds to move the ladder a couple feet, instead leaning over as far as you can to get those last few lights hung.

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This is yet another reason the emergency room is such a popular place over the holidays. According to the U.S. Consumer Product Safety Commission, in 2012 there were 15,000 ER visits directly related to festive decorating, or 250 a day over November and December. And the number appears to be increasing every year, meaning we are not taking this killer holiday seriously enough.

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Then there is the little issue of candles. Even people who would never have an open flame in the house at any other time of year probably light a candle or two around Christmas. And what better time to do so, considering you have what amounts to a pile of kindling standing in the corner. Even if you don't light candles, electrical problems are also common fire starters during the holidays. (It's those cheap lights again. You should have splurged on the fancy ones, Scrooge.) Between 2007 and 2011, an average of 230 major home fires a year started at the Christmas tree, resulting in deaths, injuries, and millions of dollars in property damage. And once again, not celebrating Christmas isn't necessarily a free pass. While they are less common, menorah fires totally happen as well. So the real miracle of Hanukkah might not be that the lamp burned for eight days, but that it didn't burn down the temple in the process.

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