In some types of small cell lung cancer, the body’s immune system tries to fight the cancer. Unfortunately, immune cells can end up destroying nerve endings instead.
The nerve endings that are attacked are responsible for muscle contractions. When they’re damaged, you can’t properly use your muscles, leading to muscle weakness. This condition is called Lambert-Eaton myasthenic syndrome. While it can be caused by other conditions, about 50 to 60 percent of people with the syndrome have lung cancer.
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