According to a 2019 critical review of Cassell's work, his views on the nature of suffering were "close to canonical" in the medical community.[5] Cassell advanced a subjective view of suffering, according to which the condition must be understood by reference to the beliefs and perceptions of the person experiencing it.[5]
In 2001, Cassell published a study in Annals of Internal Medicine that assessed the decision-making capacity of severely ill adults, finding that their decision-making abilities were similar to those of children under 10. Commenting on his findings, Cassell stated, "I think it's grossly unfair and I actually think it's an abuse of a patient to put someone in a position to make decisions when they don't have the capacity to make them."[6]
Cassell, Eric J. (1976). The Healer's Art: A New Approach to the Doctor-Patient Relationship. Philadelphia: Lippincott. ISBN0-397-01098-2. OCLC1958247.[7]