Influenza (Flu). The flu is an infectious disease that causes symptoms such as fever, cough, sore throat, headache, muscle aches, and chills.The annual flu vaccine can prevent most of the circulating influenza strains.Read about flu symptoms, and learn more about the flu shotÂ».nfluenza (Flu). The flu is an infectious disease that causes symptoms such as fever, cough, sore throat, headache, muscle aches, and chills.
Bipolar disorder, also known as manic-depressive illness, is a brain disorder that causes unusual shifts in mood, energy, activity levels, and the ability to carry out day-to-day tasks.Symptoms of bipolar disorder are severe.They are different from the normal ups and downs that everyone goes through from time to time. Bipolar disorder symptoms can result in damaged relationships, poor job or school performance, and even suicide.ymptoms of bipolar disorder are severe. They are different from the normal ups and downs that everyone goes through from time to time. Bipolar disorder symptoms can result in damaged relationships, poor job or school performance, and even suicide.
The exact cause of bipolar disorder is not known. We do know that it is a brain-based medical illness and that certain structures of the brain related to emotions, behavior, and thinking are affected. Bipolar disorder may be related to an imbalance in certain chemicals in the brain, called neurotransmitters.