Abstract:Objective: To explore the application effect of patient-controlled intravenous analgesia in the combination therapy of cancer pain and depression comorbidity. Methods: 36 cases of cancer pain with depression comorbidity patients collected in our hospital from May 2021 to May 2023 were randomly assigned to the observation group and the control group, 18 cases in each group. The control group was treated with conventional oral morphine hydrochloride sustained-release tablets+Moclobemide analgesia and antidepressant treatment, and the observation group was treated with intravenous self-control analgesia morphine hydrochloride injection+oral Moclobemide tablets analgesia and antidepressant treatment The degree of depression and the frequency of cancerous pain outbreaks. Result: The degree of pain, depression, and the frequency of cancerous burst pain attacks in the observation group were significantly lower than those in the control group (P<0.05). Conclusion: The use of intravenous patient-controlled analgesia combined with medication to treat comorbidities of cancer pain and depression can significantly reduce the degree of pain, depression, and the frequency of cancerous burst pain attacks in patients, which has clinical application value.