Nichiren Buddhism regards suffering as an inescapable feature of human existence, yet not as a fixed fate or divine punishment. It is explained as the working of karma, arising from causes made in this and previous lives, and rooted in a fundamental ignorance of one’s inherent Buddha nature and the Mystic Law. This ignorance gives rise to the three poisons—greed, anger, and foolishness—which in turn generate negative karma and perpetuate cycles of distress across the various life‑states. The deepest cause of suffering, therefore, is not external circumstance but the inner failure to recognize that life itself is endowed with Buddhahood.

Within this framework, suffering assumes a paradoxically positive role as a catalyst for spiritual awakening. Hardship prompts a person to question superficial values and to seek a more profound basis for happiness, thereby opening the door to faith in the Lotus Sutra. Nichiren’s teaching emphasizes that by chanting Nam‑myōhō‑renge‑kyō with unwavering faith, practitioners can confront and transform the very karma that underlies their difficulties. This is expressed in the doctrine of “changing poison into medicine,” where the same experiences that once caused despair become the raw material for wisdom, courage, and compassion.

Suffering thus becomes the arena in which Buddhahood is both realized and demonstrated. Rather than aspiring to a life devoid of problems, Nichiren Buddhism encourages the development of an unshakable inner state that can transform any circumstance into a source of value. In this view, persecution, illness, and social turmoil are not merely misfortunes to be endured but opportunities to manifest the power of the Mystic Law in concrete, lived experience. Overcoming adversity through faith in the Lotus Sutra is regarded as the proof of enlightenment in this very lifetime, not in some distant future.

As suffering is transformed, it also deepens empathy for others and gives rise to a sense of mission. Personal struggles become the basis for encouraging those who face similar trials, turning individual pain into a vow to help relieve the suffering of all people through sharing the practice of Nam‑myōhō‑renge‑kyō. In this way, suffering is not only transcended but also woven into a broader movement of compassion, where each person’s inner revolution contributes to the liberation of countless others.