Cancer continues to represent one of the major causes of mortality in the world. The increased aging and growth of the population, together with certain risk factors (tobacco, alcohol, overweight, obesity, sedentary lifestyle…) contribute to the increase in cancer. Cancer patients present a large number of symptoms, which makes it necessary to have validated instruments for their measurement and control, thus improving the quality of life of the patients. The objective has been to describe and summarize the existing scales and questionnaires that assessed cancer patients. Six single symptom questionnaires or scales and seven several symptoms’ scales or questionnaires were found. All these scales and questionnaires assessed from 1 to 32 symptoms, covering all the potential symptoms that patients can suffer from the last week until the time they fill in them. There is no clear consensus about which is the best scale or questionnaire for these patients. The scale or questionnaire should be adapted to the patients, to the main symptoms they feel, the time they are able to spend regarding their health status, and their cognitive function. Validated and feasible scales in questionnaires are necessary to prescribe adapted treatments in this population to achieve the best quality of life for them.