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 flu is caused by a virus and spread mainly by coughing, sneezing or close contact. Young children and older adults are at highest risk of getting the flu but anyone can get it. What are the symptoms? Unlike a cold, flu symptoms start suddenly. They appear about 1-4 days after a person is exposed to the flu. Symptoms may include: 1  Fever or feeling feverish/chills. 2  Cough. 3  Sore throat. 4  Runny or stuffy nose. 5  Muscle or body aches. 6  Headache. 7  Tiredness. 8  Some people may have vomiting or diarrhea; this is more common in children.