Okay let me explain this from a Doctor’s view:
We would make a pain control plan for each patient, but naturally every human is different and reacts differently to cancer.
Mostly, we would choose Morphine to moderate cancer esp in stage 4. (End-stage cancers.) But some patients do not tolerate morphine as they suffer severe adverse side effects, although this is rare. Sometimes some patients refuse it due to their beliefs. If allergic, we try Demerol, katamine, fentanyl etc. There are many other alternative meds.
Sadly in stage 4 cancer the realism is the patient is dying. It is an immune system disease and there will be a point where you won’t be able to fight it anymore. The body will naturally prepare for the final breakdown and these stages are tough on all cancer patients. No medicine can prevent your body from preparing its breakdown and dying as there is no cure for cancer yet.
End-stage cancer makes you tired, tightens your chest, breathing problems, mouth problems i.e. thrush or mucus blockage etc, fever, nausea, vomiting, bowel problems, dizziness, fear, panic, spinal cord compression, numbness, suffocation, chronic cough, discomfort. Then the cancer causes the vital organs to shut down…one by one…until the cancer patient can’t survive.
Of course you can choose heavy sedation but most people want to see and hear their loved ones until the end.
Your hearing is the last to go right before your soul is taken. Because of this my mother decided she didn’t want to be sedated as in the last stage, she knew she would go into a trance (which happens at end of cancer) and she wanted to hear us say kalima in her ears until the end.
So no one is zalim as you think Mirch except the culprit which is cancer.
I think you are not a doctor but an expert at googling like me. I do googling for living so I know all about it.