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Influenza (flu) is a respiratory illness caused by a virus. Flu symptoms include fever, cough, sore throat, runny nose, headache, fatigue, and muscle aches. The flu may be prevented with an annual influenza vaccination.

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    Related Diseases & Conditions

    • Upper Respiratory Tract Infection An upper respiratory infection is a contagious infection of the structures of the upper respiratory tract, which includes the...learn more »
      In This Article
      Upper Respiratory Tract Infection Article
      • Upper respiratory infection facts
      • What is an upper respiratory infection?
      • Is an upper respiratory infection contagious?
      • What are the causes of upper respiratory infection?
      • What are the risk factors for upper respiratory infection?
      • What are the symptoms of upper respiratory infection?
      • When should you seek medical care for upper respiratory infection?
      • How is an upper respiratory infection diagnosed?
      • What is the treatment for upper respiratory infection?
      • What are some of the home remedies for upper respiratory infection?
      • What are some data on alternative therapies in treating upper respiratory infections?
      • What are the complications of an upper respiratory infection?
      • Can an upper respiratory infection be prevented?
      • What is the outlook for a patient suffering from an upper respiratory infection?
    • Headache Headaches can be divided into two categories: primary headaches and secondary headaches. Migraine headaches, tension headaches,...learn more »
      In This Article
      Headache Article
      • Headache facts
      • What is a headache?
      • How are headaches classified?
      • What are primary headaches?
      • What are secondary headaches?
      • What are cranial neuralgias, facial pain, and other headaches?
      • What causes tension headaches?
      • What are the symptoms of tension headaches?
      • How are tension headaches diagnosed?
      • How are tension headaches treated?
      • What causes cluster headaches?
      • What are the symptoms of cluster headaches?
      • How are cluster headaches diagnosed?
      • How are cluster headaches treated?
      • Can cluster headaches be prevented?
      • What diseases cause secondary headaches?
      • How are secondary headaches diagnosed?
      • What are the exams and tests for secondary headaches?
      • When should I seek medical care for a headache?
    • Bronchitis (Acute) Bronchitis is inflammation of the airways in the lung. Acute bronchitis is is short in duration (10 to 20 days) in comparison...learn more »
    • Eustachian Tube Problems (Problems Clearing Your Ears) The Eustachian tube is a membrane lined tube that connects the middle ear space to the back of the nose. Problems include partial...learn more »
      In This Article
      Eustachian Tube Problems (Problems Clearing Your Ears) Article
      • What is the Eustachian tube?
      • What are the functions of the Eustachian tube?
      • What can cause Eustachian tube blockage?
      • How do changes in altitude or air travel affect Eustachian tube problems?
      • How is Eustachian tube blockage treated?
      • Eustachian Tube Problems At A Glance
    • Mercury Poisoning Mercury is a naturally occurring element found in water, soil, and the air. Mercury is also contained in some fish, some of the...learn more »
      In This Article
      Mercury Poisoning Article
      • Mercury poisoning facts*
      • Mercury introduction
      • General information about mercury and mercury exposure
      • What are the health effects and symptoms of mercury exposure or poisoning?
      • What about mercury in batteries?
      • What about mercury in dental amalgam?
      • What about mercury in fish?
      • What about mercury in fluorescent light bulbs?
      • What about thimerosal in vaccines?
      • What about mercury in thermometers for fever?
      • What about mercury in recycling and waste disposal?
      • How are mercury spills cleaned up?
      • What are more mercury-containing products?
      • How can I find out about mercury exposure where I live?
    • Chronic Bronchitis Chronic bronchitis is a cough that occurs daily with production of sputum that lasts for at least three months, two years in a...learn more »
      In This Article
      Chronic Bronchitis Article
      • Bronchitis facts
      • What is bronchitis?
      • What is acute bronchitis?
      • What are the symptoms of acute bronchitis?
      • What is chronic bronchitis?
      • What are the causes of chronic bronchitis?
      • What are the risk factors for chronic bronchitis?
      • What are the symptoms of chronic bronchitis?
      • When should an individual seek medical care for chronic bronchitis?
      • How is chronic bronchitis diagnosed?
      • What is the treatment for chronic bronchitis?
      • What are the complications of chronic bronchitis?
      • Can chronic bronchitis be prevented?
      • What is the outlook (prognosis) for chronic bronchitis?

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Terms related to Influenza:

  • Flu