Carlos Santana drew criticism after telling an audience at Red Rocks in Colorado that holding grievances causes cancer and that forgiveness could ensure people never develop the disease. The remarks, made during his Oneness Tour on 24 August, were widely seen as medically unfounded and potentially victim-blaming towards people with cancer.

Santana said an unnamed cancer specialist had never met a patient without grievances, while promising the crowd they would be “clean” if they let go of resentment. Video showed some audience members applauding, but online commenters challenged the claims, particularly their implications for children and others affected by cancer; the article does not report any response from Santana.