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.
The symptoms of influenza (flu) appear suddenly and often include: 1  Fever of 100.4Â°F (38Â°C) to 104Â°F (40Â°C) , which can reach 106Â°F (41Â°C) when symptoms first develop. 2  Fever is usually continuous, but it may come and go.3  Fever may be lower in older adults than in children and younger adults. Body aches and muscle pain (often severe), commonly in the back, arms, or legs. 2  Headache. 3  Pain when you move your eyes. 4  Fatigue, a general feeling of sickness (malaise), and loss of appetite. 5  A dry cough, runny nose, and dry or sore throat.