A 35-Year-Old Marathoner Was Healthy and Fit—Then He Got Colorectal Cancer
I thought I was just training too hard and it was rupturedhemorrhoidsor something, Johnson told Verywell. Johnson underwent acolonoscopytwo weeks after running the marathon. Right after the procedure, the doctor told John that he may have a cancerous mass in his rectum. Photo Illustration by Amelia Manley for Verywell Health; John B. Johnson A biopsy confirmed this suspicion, and at age 35, Johnson was diagnosed with stage 2colorectal cancer. I was really mad that this was happening to me....