In the autumn of 2016, I completed my second marathon. I was an ambitious 35-year-old athlete, participating year-round in activities that included running, road cycling, triathlon and alpine skiing. I was fit and well, and apart from pollen allergies I had not had any medical treatment. Approximately 3 hours after the marathon, I developed my first episode of bloody diarrhoea. As a doctor, I suspected this to be runner’s colitis but was not overly concerned. I knew that a proportion of marathon runners report gastrointestinal complaints.1 In the following days, my diarrhoea disappeared, but the blood in my stool persisted. Without any worrisome thoughts, I first underwent a proctoscopy which showed small haemorrhoids. These were treated, but because I still had blood in my stool I had a sigmoidoscopy a few weeks later. At this investigation, the gastroenterologist showed me the tumour in my rectum, and I knew what this meant. I had a biopsy, and the information from this (and the requisite additional imaging) meant that I was needed radiochemotherapy and surgery. Before the operation, I searched for additional support from sport and exercise medicine specialists as I knew this would help me through my therapy. I was …

中文翻译：

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当一名马拉松运动员疑似患“跑步者结肠炎”时，结果证明是癌症——并最终导致新的个人最佳马拉松时间

2016 年秋天，我完成了我的第二个马拉松。我是一名雄心勃勃的 35 岁运动员，常年参加跑步、公路自行车、铁人三项和高山滑雪等活动。我身体很好，除了花粉过敏，我没有接受任何治疗。跑完马拉松大约 3 小时后，我出现了第一次血性腹泻。作为一名医生，我怀疑这是跑步者的结肠炎，但并没有过分担心。我知道有一部分马拉松跑者报告肠胃不适。1 在接下来的几天里，我的腹泻消失了，但我的便血仍然存在。没有任何担心的想法，我首先进行了直肠镜检查，结果显示有小痔疮。这些都得到了治疗，但由于我的粪便中仍有血，几周后我进行了乙状结肠镜检查。在这次调查中，胃肠病学家给我看了直肠里的肿瘤，我知道这意味着什么。我进行了活组织检查，从中获得的信息（以及必要的额外成像）意味着我需要进行放化疗和手术。手术前，我寻求运动和运动医学专家的额外支持，因为我知道这会帮助我完成治疗。我曾是 …