I felt much better after my thymectomy for a few days. When I started to decline, I asked the nurse why (I was in ICU because of problem coming off the vent after surgery) and she told me I was feeling the benefit of IV steroids they gave me during surgery to help reduce swelling. She told me it affects everyone that way, but most people don't realize the benefit is from the solumedrol. It took me several months to feel a benefit from the thymectomy. Hope this helps.