Answered by Suzi, Hiring Expert at HP Inc., on Monday, October 26, 2015
If you left your role last semester with sufficient notice and the proper notifications to your manager and team, and provided them with detailed project status, it should simply be a matter of reaching out to let your manager know that your situation has been resolved, and that you would like to return to the team, if work is available for you. Be honest and straightforward, and deal with the situation head-on. You may want to "script out" your side of the conversation to prepare for what might be a difficult conversation. It isn't necessary to disclose sensitive details about your illness, but simply saying "I had a medical issue and I took care of it. I'm ready to get back to work" may be sufficient, to get your foot back in the door, if you left in good standing.