If you have quit taking simvastatin
recently (within a month or less) and have been experiencing left arm pain
, it could be a possible side effect of simvastatin. It requires some time for the muscles to get back to their normal function if they got damaged.
Another cause could be arthritis
of left arm. If you do not have any heart problem (or other health problem); such pain could not be worrisome.
Take oral painkillers and apply local analgesics together with warm clothing.
If no improvement or you notice any unusual symptom, please consult a rheumatologist
All the best!