The Rebbe advises following the doctor’s guidance, emphasizing that maintaining diet and self-control may prevent surgery. He encourages focusing on Hashem’s kindness, appreciating past miracles, and seeing current challenges in perspective. With Kislev being a month of miracles, he blesses the recipient with health and good news for their family.
https://www.torahrecordings.com/rebbe/igroskodesh/014/003/4908