**4. Methods of pain assessment (pain assessment tools)**

Assessment is the rigorous process of documentation, self-knowledge and interpretation. The need for cancer pain assessment during and after the treatment at the end-of-life stage is very important. Many contributing factors may affect the diagnosis of the source of the pain. Due to the varied nature complexity in the classification of pain, there is no consensus on a common pain assessment tool. This is to be noted and a common effective method should be there to evaluate the pain and its history in the patient. Since the pain assessed is in the boundary of cancer, the method to stage malignancy and its type is measured by TNM classification of cancer. Since its discovery, it has been proficiently helping in the further planning of treatment to be provided. With the staging ranging from 1 to 4 with the fourth being severe [3, 6]. TNM staging plays an important role in the assessment of the pain as it can convey information about size, if it is malignant or if it has spread into the lymph [6]. Similarly, widely used pain assessment tools are

