Most musculoskeletal conditions caused by trigger points worsen with certain movements.  The muscles listed on this page are known to lead to most pain when laying down on the side. They are listed in the descending order from the most frequently involved, to the least frequently involved. Write down the names of the top three muscles on this list. Return to the previous page and select another movement that causes you the most discomfort. When you are done, return to the section “activities causing pain” and follow the instructions on how to design your personalized treatment protocol. Click on the tab "Muscle's Monograph" for the list of the most frequently involved muscles in the back pain for detailed information about the symptoms, causes for developing their trigger points and treatment options for the particular muscle. You can quickly access the same information for the muscles discussed in this section by clicking on each individual muscle below.