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.
Common signs and symptoms of the flu include: 1  Fever over 100 F (38 C). 2  Aching muscles, especially in your back, arms and legs. 3  Chills and sweats. 4  Headache. 5  Dry, persistent cough. 6  Fatigue and weakness. 7  Nasal congestion. 8  Sore throat.