Cancer pain treatment purposes to release pain with slight adverse treatment effects, allowing the person a good quality of life and level of function and a relatively painless death. Though 80-90 percent of cancer pain can be controlled, half of the people with cancer pain in the developed world and more than 80% of people with cancer worldwide receive less than best care.Cancer changes over time, and pain managing needs to reflect this. Some different types of treatment may be required as the disease progresses. Pain managers should clearly explain to the person the cause of the pain and the various treatment possibilities and should consider, as well as drug therapy, directly modifying the underlying disease, raise the pain threshold, interrupting, destroying or stimulating pain pathways, and suggesting lifestyle modification. Cancer survival rates vary by the type of cancer, stage at diagnosis, treatment was given and many other factors, including country. Survival rate can be measured in several ways, median life expectancy having advantages over others in terms of meaning for people involved, rather than as an epidemiological measure.