If a physician has ruled out these serious causes of chest pain, other causes may be explored. Common causes of upper back pain that do not involve the spine include: Heart attack. Pneumonia and pleuritis. High blood pressure. Fibromyalgia (widespread muscle pain and tenderness) or other chronic pain syndromes.
1 The normal potassium level in the blood is 3.5-5.0 milliEquivalents per liter (mEq/L). 2  Potassium levels between 5.1 mEq/L to 6.0 mEq/L are considered to be mild hyperkalemia. 3  Potassium levels of 6.1 mEq/L to 7.0 mEq/L are moderate hyperkalemia, and levels above 7 mEq/L reflect s evere hyperkalemia.t is also important for maintaining normal heart electrical rhythm and for normal electrical signals in the nervous system. 1  The normal potassium level in the blood is 3.5-5.0 milliEquivalents per liter (mEq/L).
Potassium is fairly abundant in the body with a total content of about 135 grams (3500 mmol). Most, 98% to be exact, is found inside the cells, while the remaining 2% or about 2700 mg is. found outside the cells, more specifically in blood serum. Blood serum level is normally. maintained between 3.5 and 5.3 mmol/L.