Normal Levels. Blood sodium levels are measured in terms of millequivalents per liter or (mEq/L). The normal range for blood sodium is 135 to 145 mEq/L, according to Medline Plus. physician will often begin to monitor blood sodium levels when they drop lower than the 120 mEq/L range. While some adults can function sufficiently at these levels, many may have symptoms such as fatigue, lethargy, confusion, muscle cramps and nausea.
Rating Newest Oldest. Best Answer: The brain produces Endorphins to ease/relieve pain. The brain also produces seratonin, dopamine, melatonin, and others. Adrenaline is produced by the adrenal glands which rest on top the kidneys.
Hydrocodone. 1  A chemical derivative of opium that is used in modern day medications for the relief of moderate to severe pain. Because it acts directly on the brain and spinal cord, it most definitely causes a state of euphoria when taken in slightely greater doses (ex.-three tablets instead of one).