This study is:

• A single-center, randomized, prospective controlled trial.
• To prove superiority of active pain management group compared to control group by the percent of pain intensity difference of outpatients with lung cancer pain.
• 204 patients will be recruited.

• The recruited patients in both group will be provided the education about pain-killer, and received medicines including opioids according to their numeric rating scale (NRS)

• Active management group will be provided additional telephone counseling and dosage modification by specialized nurse for cancer pain.

• The percent of pain intensity difference (%PID)

  • PID = (NRS of visit 1 - NRS of visit 3)/NRS of visit 1

Inclusion Criteria:

• Outpatients with lung cancer.
• The patients with uncontrolled lung cancer pain - more than and equal NRS 4 pain during previous 24 hours for background pain, or more than and equal 3 times/day for breakthrough painkiller medication.
• Over 20 year-old male or female.
• The patients can be able to received telephone counseling by investigator's decision.

Exclusion Criteria:

• Drug or alcohol abusers.
• Child-bearing women or pregnant women.
• The patients with moderate to severe psychiatric problems.
• The patients who have hypersensitivity to opioids.