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.
Symptoms. Initially, the flu may seem like a common cold with a runny nose, sneezing and sore throat. But colds usually develop slowly, whereas the flu tends to come on suddenly. And although a cold can be a nuisance, you usually feel much worse with the flu. Common signs and symptoms of the flu include: Fever over 100.4 F (38 C) Aching muscles, especially in your back, arms and legs; Chills and sweats; Headache; Dry, persistent cough; Fatigue and weakness; Nasal congestion; Sore throat; When to see a doctor. Most people who get the flu can treat themselves at home and often don't need to see a doctor.