The flu (influenza) is a highly contagious respiratory infection caused by a virus. Children are most vulnerable to flu infections, but the elderly and people with lung disease or other chronic conditions have a higher risk of complications than others. Typically, flu symptoms include chills and a fever over 103 degrees; muscle aches, weakness and [...]

If you are plagued by a scratchy throat, runny nose and cough, you probably have a viral infection of the head and throat, known as the common cold. There are more than 200 cold viruses, which is why it is so easy to catch a cold, and why the symptoms can vary so much. There [...]

Anyone who suffers from migraine headaches knows what a painful experience it can be. Migraine is more than a severe headache. It is frequently accompanied by visual disturbances (blind spot or a bright light with fuzzy, sparkling edges) or auditory changes (sounds are louder than usual). Nausea is not infrequent and the headaches are one-sided. [...]

The most common reason for a toothache is a cavity caused by dental plaque, a sticky substance made up of food bits, saliva and bacteria. Plaque produces acids that corrode the protective enamel on the teeth. A toothache can also be the result of something as simple as food wedged between the gum and tooth, [...]