Blood serum concentrations are much lowerâonly about 0.4% of the body's potassium is found in blood serum. As noted above, hypokalemia can be caused by the sudden uptake of potassium ions from the bloodstream by muscle or other organs or by an overall depletion of the body's potassium.
Early symptoms of the flu may include conditions such as excessive or sudden fatigue or body aches and chills, according to Healthline. While fatigue can be an early symptom of a cold, in people who have the flu, the fatigue is much worse.
Influenza, commonly known as the flu, is a contagious respiratory illness caused by viruses that infect the nose, throat, and lungs. It can range from mild to severe. When ill with the flu, people often feel some (or even all) of these flu symptoms: 1  Fever or feeling feverish/chills (not everyone with the flu actually gets a fever) 2  Cough. 3  Sore throat. 4  Runny or stuffy nose. 5  Muscle or body aches. 6  Headaches.