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.
Flu usually starts with the abrupt onset of fever, headache, fatigue and body aches. Here's a list of flu symptoms you might feel: 1  High temperature. 2  Severe aches and pains in the joints and muscles and around the eyes. 3  Generalised weakness. 4  Ill appearance with warm, flushed skin and red, watery eyes. 5  Headache. 6  Dry cough. 7  Sore throat and watery discharge from your nose. 8  Diarrhoea or upset stomach.