Nichiren Buddhism understands suffering as a fundamental feature of human existence, in line with the broader Buddhist notion of dukkha. Birth, aging, sickness, and death, along with the many frustrations and disappointments of daily life, are seen as inescapable aspects of living beings’ condition. This suffering is not random: it arises from causes and conditions, especially negative karma created through thoughts, words, and deeds. Such karma manifests as obstacles, illness, and adverse circumstances that hinder spiritual progress. Yet this view does not portray suffering as punishment from an external power, but as the natural effect of one’s own actions unfolding over time.

At a deeper level, Nichiren Buddhism locates the ultimate source of suffering in fundamental ignorance of one’s true nature. This ignorance gives rise to the “three poisons” of greed, anger, and foolishness, which in turn generate further negative karma and perpetuate the cycle of dissatisfaction. The inner state and the outer world are seen as inseparably linked, so that internal “spiritual poison” is reflected in the environment and life conditions. In this way, suffering reveals the intimate connection between the individual and the surrounding world, showing how inner delusion shapes outer experience.

Faith in the Lotus Sutra, expressed through chanting Nam‑myoho‑renge‑kyo, is presented as the direct means to address suffering at its root. Through this practice, practitioners are said to reveal their inherent Buddha nature and transform the deep karmic causes that give rise to misery and confusion. Suffering is not denied or merely endured; rather, it becomes the very arena in which Buddhahood is manifested. Difficulties and hardships, when met with faith and practice, function as expedient means that deepen conviction in the Lotus Sutra and open the way to liberation.

For this reason, Nichiren Buddhism speaks of transforming suffering into a catalyst for growth, wisdom, and compassion. Even the gravest adversity can be “changed from poison into medicine” when illuminated by the perspective of Buddhahood. This transformation does not necessarily remove all external problems, but it alters the fundamental life condition from which those problems are experienced. In that transformed state, suffering becomes a shared, purposeful path: practitioners seek not only to overcome their own pain, but also to use their experience to work for the peace and happiness of others, embodying the bodhisattva spirit within the realities of everyday life.