There are several causes of cancer pain, however usually cancer pain happens once a tumour presses on nerves or body organs or once cancer cells invade bones or body organs. Cancer treatments like therapy radiation, or surgery conjointly might cause pain. Cancer pain is acute or chronic. Acute pain is owing to injury caused by AN injury and tends to solely last a brief time. For instance, having an operation will cause acute pain. The pain goes once the wound heals. Within the in the meantime, painkillers can typically keep it in check. Chronic pain is pain caused by changes to nerves. Nerve changes might occur owing to cancer pressing on nerves or owing to chemical produced by a tumour. It may also be caused by nerve changes owing to cancer treatment. The pain continues long once the injury or treatment is over and may vary from delicate to severe. It is there all the time and is additionally referred to as persistent pain. Chronic pain is tough to treat, however painkillers or alternative pain management strategies will usually with success management it.