Why Does God Allow Disease? A Three-Faith Comparison

In the Hebrew Bible, disease is woven tightly into the fabric of covenant theology. God presents himself explicitly as Israel's healer — YHWH Ropheka — and the conditional promise is stark: obey, and sickness stays away; disobey, and it returns Exodus 15:26. This isn't incidental; it's structural to the Sinai covenant. The blessings and curses of Deuteronomy 28 spell out in clinical detail that persistent, severe illness is among the covenant's penalties Deuteronomy 28:59, including a chilling promise to revisit the diseases of Egypt upon a disobedient Israel Deuteronomy 28:60.

Rabbinic tradition, however, complicated this simple equation considerably. The Talmud (Berakhot 5a) introduced the concept of yissurin shel ahavah — 'afflictions of love' — suggesting that righteous people may suffer precisely because God loves them, refining their souls. Maimonides (12th century) argued in the Guide for the Perplexed that most illness results from human choices about diet and environment, not direct divine punishment. So while the Torah's covenantal framework ties disease to disobedience Deuteronomy 28:61, later Jewish thought resists reducing every illness to a moral ledger.

The Psalms offer a more pastoral register: God is the one 'who healeth all thy diseases' Psalms 103:3, framing healing as an act of divine mercy rather than merely the removal of punishment. Isaiah's eschatological vision promises a future where no inhabitant will say 'I am sick' Isaiah 33:24, suggesting that disease, whatever its present cause, is ultimately incompatible with God's final purposes for humanity.

Christianity inherits the Hebrew Bible's covenantal framework but reframes it dramatically through the lens of Christ's incarnation, suffering, and resurrection. The New Testament doesn't abandon the idea that sin introduced disease into the world — Paul's argument in Romans 5 and 8 connects cosmic disorder, including bodily suffering, to the fall. But it decisively breaks the one-to-one equation between individual sin and individual illness. When Jesus is told that Lazarus is sick, his response is striking: 'This sickness is not unto death, but for the glory of God, that the Son of God might be glorified thereby' John 11:4. Disease, in this reading, can be the stage on which divine power and compassion are most vividly displayed.

Theologians across the centuries have wrestled with this. Augustine (354–430) saw suffering as a consequence of original sin but also as a tool of divine pedagogy. C.S. Lewis, in The Problem of Pain (1940), argued that pain is 'God's megaphone to rouse a deaf world.' Reformed theologians like John Calvin emphasized God's absolute sovereignty — nothing, including disease, falls outside his providential will. Meanwhile, liberation theologians and disability scholars like Nancy Eiesland have pushed back, warning against theologies that too easily spiritualize suffering at the expense of those actually enduring it.

Christianity also holds out the promise, echoing the Psalms, that God heals Psalms 103:3, and that the ultimate eschatological horizon — the new creation — will be a world without sickness, consistent with Isaiah's vision Isaiah 33:24. The tension between present suffering and future healing is, for many Christian theologians, the very heart of what it means to live in the 'already but not yet' of the Kingdom of God.

Islam's approach to disease is shaped by two foundational convictions: God's absolute sovereignty (qadar) and his essential mercy (rahma). The Quran states that 'no calamity befalls except by the permission of Allah' (Quran 64:11), and the Prophet Muhammad (hadith, Sahih Bukhari) taught that 'no fatigue, nor disease, nor sorrow, nor sadness, nor hurt, nor distress befalls a Muslim, even if it were the prick he receives from a thorn, but that Allah expiates some of his sins for that.' Illness, then, is not primarily punitive — it's expiatory and purifying. This stands in some contrast to the Deuteronomic framework, though the Quran does acknowledge that some suffering results from human wrongdoing (Quran 42:30).

Classical Islamic scholars like Ibn Qayyim al-Jawziyyah (14th century) developed a rich theology of illness in works like Medicine of the Prophet, arguing that disease serves at least four purposes: expiation of sin, elevation of spiritual rank, a test of patience (sabr), and a reminder of human dependence on God. Importantly, Islam strongly encourages seeking medical treatment — the Prophet reportedly said 'Make use of medical treatment, for Allah has not made a disease without appointing a remedy for it' (Abu Dawud). Faith and medicine are not in tension; both are expressions of trusting God's provision.

The eschatological dimension is present in Islam too: paradise (jannah) is described as a realm free from all illness and pain, echoing the vision in Isaiah that the redeemed community will no longer say 'I am sick' Isaiah 33:24. The Psalms' affirmation that God heals all diseases Psalms 103:3 finds a clear parallel in Islamic theology, where Al-Shafi ('The Healer') is one of the divine names, and every cure is ultimately attributed to God alone.