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You feel crummy as it is. All that sneezing and coughing is misery enough.

Don't make one of these common mistakes that can make your cold even worse.

Pretend You're Not Sick

It never works. You can't ignore a cold. When you get sick, you have to take care of yourself.

Your body needs extra energy when it fights an infection. If you try to push through a cold, especially if you have a fever, you'll exhaust yourself. That could make your symptoms worse.

Sleep Too Little

Getting enough shut-eye is key for a healthy immune system, your body's defense against germs.

One study shows that sleeping less than 7 hours a night almost triples your risk of catching a cold in the first place.

If you have a cold and your symptoms are keeping you up at night, go to bed earlier or take naps during the day. You need extra rest, however you get it.

Get Stressed Out

It can make you more likely to get a cold.

Over time, high levels of stress hormones can stop your immune system from working normally. The result: more sick days.

Drink Too Little

You need a lot of fluids when you're sick. They help thin your mucus, which makes your sinuses drain better.

Just about any liquid will help. Water, juice, hot tea, and soup are all good. Even milk is OK, despite what you may have heard. The idea that it causes mucus buildup is a myth.

Drink Alcohol

Too much of it leaves you dehydrated and makes symptoms like congestion worse.

Alcohol puts a damper on your immune system. And it might mix badly with cold medications you're taking. So until you feel better, it's best to lay off the booze.

Overuse Decongestant Sprays

They may work well at first. But if you use them for more than 3 days, your stuffy nose will get worse when you stop.

Smoke

Smokers get more colds than non-smokers. Their symptoms are also worse and they last longer.

Lighting up damages cells in your lungs, which makes it harder for you to fight off a cold. If you're sick, don't smoke -- and don't let anyone around you do it either.