So far, comparably little research has been conducted on psychological effects of being diagnosed with colorectal cancer. Thus, this thesis aims to make the emotional process experienced by those diagnosed more transparent in order to treat the latter appropriately. Therefore, this thesis addresses the following research question: "How do people experience their situation psychologically after being diagnosed of colorectal cancer?" Based on a literature review, it can be stated that, following the diagnosis, the lives of those affected fall apart, leading to an emotional crisis, probably the deepest in their lives. At each stage of the disease, a different mental challenge has to be overcome. The aim is to provide the affected people depending on the emotional status a corresponding quality of life. Against this background, the following aspects are crucial: 1. Taking time for patients in order to collect them in the “here and now”. 2. Forging a trusting patient-carer relationship in order to reduce fears and inhibitions. 3. Taking problems and concerns of those affected seriously. 4. Enabling a feeling of safety by providing support throughout the disease process.