Patients may refuse medical treatment when they are in extreme pain and have no desire to continue a treatment that is not improving their quality of life.
For some people, quality of life is more important than length of life. In that case, a patient who feels extremely uncomfortable physically may choose to discontinue treatment.
There are certain procedures that some patients choose not to endure. If one of these procedures becomes necessary, it is possible the patient would choose to refuse that specific treatment.
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