My daughter is 23 and generally healthy. This week she came to visit. It is a 6 hr. drive. One day after arriving she had chest pain on the left side from shoulder to under her breast. She went to the ER and had lots of tests, nothing wrong other than a bladder infection. The next night the pain doubled in intensity, she said 10 on a scale of 1 to 10. I took her back to the ER, and they again did blood work, X-ray and CAT scan. All testing was normal, there was a left small pleural effusion. The doctor said she couldn't find anything really wrong, suggested more testing with her PCP. The pain was intense and a similar situation has happened before after traveling. She also gets migraines and is on LoEstrin birth control. I am worried that there may be something serious wrong. She has had pleurisy in the past as well.