Low levels of potassium in the blood, a condition known as hypokalemia, may be deadly, because potassium is needed for healthy nerve and muscle function. Low potassium may disrupt the heartbeat. Normally, blood levels of potassium are between 3.6 and 4.8 milliequivalents per liter, or mEq/L. Hypokalemia occurs when potassium levels fall below 2.5 mEq/L, notes MayoClinic.com.
Muscle Symptoms
A small decrease in potassium levels does not usually cause symptoms, according to MedlinePlus. Most of the time, low potassium levels are picked up by a doctor's blood test. When potassium levels drop more severely, a patient may experience muscle cramps, spasms or weakness. Hypokalemia may also cause the muscle fibers to break down -- a painful condition known as rhabdomyolysis, which can lead to kidney damage and other long-term complications.
Heart Problems
Occasionally, people with extremely low potassium levels develop an abnormal heart rhythm, according to MedlinePlus. This may cause the heart to beat too fast, too slow or in an irregular pattern, and this may be dangerous. It's most likely to occur in those who already have heart disease.
Other Symptoms
Low potassium levels may cause fatigue and constipation. In some cases, it may also cause paralysis that may affect the lungs, impairing breathing.
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