Hello, Syncope, or fainting, can be caused by various factors, including low blood pressure, dehydration, medication side effects, and heart problems. In the case of your wife, it is possible that the surgery and recovery period may have weakened her cardiovascular system, making her more prone to fainting spells. It is important to monitor her blood pressure and heart rate, as well as ensure that she is well-hydrated and not experiencing any adverse side effects from her medication. It is also possible that there may be an underlying clot or other complication, so it would be best to consult with her healthcare provider as soon as possible to rule out any serious concerns and receive appropriate treatment. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. H. Kay, General & Family Physician