The most difficult thing in treating a disease called cancer is the "fight against loneliness." The fight against cancer begins when you learn that your body has cancer. From my own experience of fighting cancer and the memories of those days, I will talk about the "fight against loneliness" that attacks when cancer develops. When I developed cancer, the most painful things I felt were the feeling of having a big hole in my heart and the feeling of loneliness approaching. It attacks itself, even if there are close family members and friends around it, and even if the surroundings are filled with a bright and peaceful atmosphere. At that time, my heart was always dominated by "loneliness." It is necessary to treat the cancer with surgery and medicine, but I feel that more mental care is needed. "My life may not be saved anymore." "I'm scared to break up with everyone" It is necessary to take care so that such anxiety disappears as much as possible. Writing is still going on.