The anxiety, depression and sleep quality of cancer patients (107) who were admitted to a oncology hospital's medical oncology ward were investigated. Data were collected using a personel information form, the hospital anxiety and depression scale and the Pittsburgh Sleep Quality Inventory. It was determined that 69 % of the patients' quality of sleep was poor, 51 % had high anxiety and 54 % had high depression. It was determined that there were significant correlations between anxiety and depression (r=.706, p<0.05), between anxiety and sleep quality (r=.438, p<0.05), and between depression and sleep quality (r=.453, p<0.05); as anxiety and depression scores increased the sleep quality worsened. The anxiety and depression scores were high in women and housewives; the anxiety and depression scores were high and the sleep quality was poor in patients receiving Supportive treatment. The cancer patients experience problems with anxiety, depression and sleep. For this reason cancer patients who are admitted to the hospital need to have their anxiety, depression and quality of sleep levels routinely evaluated in the same way as their physical condition.