Why is the disease of doubt more dangerous than physical illness?

If the intended meaning of the disease of doubt is the doubt of the heart, then it is the ailment of the hypocrites that destroys faith and indicates a lack of certainty in the declaration of monotheism. This is more dangerous than physical illness because it corrupts faith and the Hereafter. However, if the intended meaning is psychological doubt (obsessive-compulsive disorder), then it is a type of delusional disorder, and its harm can be more severe than physical illness. Specialists should be consulted regarding this.