The immune system is made up of special cells, proteins, tissues, and organs that defend people against germs and microorganisms.

Find out what the experts have to say.

Find out what the experts have to say.

Find out what the experts have to say.

Find out what the experts have to say.

Find out what the experts have to say.

Asthma flare-ups, or attacks, can be handled, but it's even better if you can prevent them from happening. Find out how to deal with flare-ups.

Dehydration is when the amount of water in the body has dropped too low. Read about what causes dehydration, what it does to your body, and how to prevent it.

Almost everyone gets headaches. So how do you know if a headache is just a passing pain or something more?

If you're afraid of shots, you're not alone. Next time your doc asks you to roll up your sleeve, try these tips.

Germs are tiny organisms that can cause disease - and they're so small that they can creep into your system without you noticing. Find out how to protect yourself.

Did you know that the most important thing you can do to keep from getting sick is to wash your hands? If you don't wash your hands frequently, you can pick up germs from other sources and then infect yourself.

Asthma flare-ups, or attacks, can be handled, but it's even better if you can prevent them from happening. Find out how to deal with flare-ups.

Taking care of your diabetes includes knowing when to call a doctor and get medical help.

Being sick is no fun for anyone. For people with diabetes, being sick can also affect blood sugar levels.