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.
For both the cold in the flu, early symptoms may be similar. Symptoms and signs include a cough, runny nose, and feeling tired. If you know you have had contact with someone with a cold or the flu in the past few days, you should suspect you may have become infected.