[Pain in patients with cancer]

All cancer patients will inevitably experience pain during their illness, whether it is cured or not: acute pain induced by the treatment and examinations required for diagnosis; chronic pain associated with the evolution of the disease or sequelae caused by treatment. These pains must be treated imperatively as accompanying symptoms. The practitioner should be able to analyse the components, the physiopathological, the cause(s) and the way in which they occurred. Treatment will then be prescribed, adapted and monitored according to stringent criteria so that optimal efficacy is achieved with a minimum of side effects.