Sinus drainage occurs when excess mucus drains down the back of the throat. This post-nasal drip tends to trigger coughing, and contributes to the misery of allergy and cold symptoms.

Playing a 90-minute game of soccer is an intense experience, and affects your whole body, from your brain to your feet. Playing the sport provides cardiovascular and muscular fitness. The bulk of the work is done by your legs, but you use many other muscles as well.

Standing for several hours a day puts strain on your legs and feet, and can lead to complications from overuse. In addition, standing for long periods of time, especially in poor fitting shoes, can aggravate pain caused by corn, callouses or foot deformities.

Various ligaments and bones, different types of cartilage, and the iliotibial band are located in and around the knee. A number of problems with these structures can lead to pain on the outside of the knee. Treatment depends on the underlying cause.

Waking up with a swollen eyelid can be disturbing and uncomfortable, but with treatment, the problem can be alleviated. It may be as simple as a warm compress or you may need antibiotics.

Communicable diseases are caused by germs passed from one person to another. Viruses or bacteria are the most common germs causing communicable diseases. The common cold, strep throat, gastroenteritis and herpes infections are among the most common communicable diseases.

Allergies to food can be scary and should be taken seriously. Here are 10 surprising truths about food allergies that you need to know.

It might seem like a simple task to list the most common diseases -- but it's not, for a variety of reasons. First and foremost, there is no national or global tracking system for enumerating the occurrence of most diseases.

In prediabetes and diabetes, blood sugars need to be kept as close to a normal range as possible. Monitoring your own blood sugar is the only way to tell if you are keeping your day-to-day readings -- both before and after meals -- within an acceptable range.

Botulism is a rare but serious foodborne illness most commonly caused by the bacteria Clostridium botulinum. Eating foods infected with this nerve toxin can cause paralysis and death if not treated, but there are steps you can take to avoid consuming foods contaminated with botulinum.

The skin plays a critical role in protecting the body, and provides important clues to overall health. A skin rash, for instance, may simply indicate the skin is irritated -- or may signal a more serious health problem.

Despite the name making it sound like a simple bruise, a bone bruise is a lot more painful and the pain lasts longer than the giant swelling of a bruise on the skin or in the muscle.