Simplify the following text for a Grade 7 native English-speaking person.
Original: Pain radiates most often to the left arm , but may also radiate to the lower jaw , neck , right arm , back , and epigastrium , where it may mimic heartburn .
Simplified: Pain can often also be felt in the left arm , and sometimes in the lower jaw , the neck , the right arm , the back , and in parts of the abdomen .