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.
A Honor Society of Nursing (STTI) answered. The first symptoms of influenza type A, including fever, chills, headache, and body aches, often begin to go away after about 2 or 3 days. In some cases, these symptoms will last 5 days or longer.