Underlying causes of low blood pressure. Low blood pressure can occur with: Prolonged bed rest. Pregnancy. During the first 24 weeks of pregnancy, itâs common for blood pressure to drop. Decreases in blood volume. A decrease in blood volume can also cause blood pressure to drop. A significant loss of blood from major trauma, dehydration or severe internal bleeding reduces blood volume, leading to a severe drop in blood pressure.
Influenza, commonly called the flu, is caused by viruses that infect the respiratory tract. Flu symptoms include fever, chills, cough, sore throat, headache, muscle aches, and. fatigue. The incubation period for flu is about one to four days. Flu is contagious, and symptoms may last up to seven to 14 days.
Influenza b signs & symptoms study finds influenza may be more severe than thought how long is someone with the flu contagious? (flu) kids health. It is very contagious and spreads in the u. These viruses infect the influenza a is highly contagious respiratory illness. Influenza causes how the contagious virus is spread webmd. There are two main types of influenza viruses type a and b. Children may pass the virus for longer than 7 days.