I'm a senior in college and recently landed my dream job. Part of the process is a background check that includes employment verification. I had an internship for 2 summers at a Fortune 500 company, but the second summer, had to leave after less than 2 weeks due to a health issue. I made the mistake of leaving early one day because I wasn't feeling well at all, and because the internship was hourly, I figured I'd just enter my short hours for that day.
Obviously, that was a terrible decision and it ended up being an issue with my boss and HR, who seemed to be assuming I was trying to fudge my hours. I resigned that day citing my health issues (which I was going to do anyway), and proceeded to get a couple of surgeries to rectify things. I did not include this experience on my resume, only the previous summer's.
Because these internships were at the same company, when the new employer attempts to verify my employment (both employers use 3rd party services to do so), they will definitely see that I was at the old company for less than 2 weeks last summer. This will likely lead to questions, and they may ask to speak to my former boss to verify that I left due to health issues. I am extremely worried about what else my boss might say - specifically about leaving early and questioning my integrity. I omitted this experience from the background check form as well.
I'm planning to either let my new employer ahead of time that they might see this and explain the situation, or else wait to see if they bring it up and explain things. However, I would rather not disclose my medical records/the nature of the issue - so how do I back up my claims?