I have read and heard, first hand, dozens of stories about Lipitor. It is clear why, too. When you cut off lipoproteins (commonly called "cholesterol"), you cut off the supply of essential fatty acids (EFAs) to the cell membranes of nerve cells, which use these EFAs for neurotransmission. Eventually the nerve cells degenerate and die, causing pain, stiffness, and loss of muscle control.
Typical: muscle pain, muscle weakness, swallowing problems, muscle cramps, numbness, spasms, muscle atrophy.