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.
Signs and symptoms of hepatitis B, ranging from mild to severe, usually appear about one to four months after you've been infected. Signs and symptoms of hepatitis B may include: 1  Abdominal pain. 2  Dark urine. 3  Fever. 4  Joint pain. 5  Loss of appetite. 6  Nausea and vomiting. 7  Weakness and fatigue.