Why Does God Allow Cancer? What Judaism, Christianity, and Islam Teach

Judaism doesn't shy away from the raw anguish of illness. The book of Job — arguably the tradition's most sustained meditation on innocent suffering — gives voice to that anguish directly: "Why does [God] give light to the sufferer / And life to the bitter in spirit" Job 3:20. That question isn't punished in the text; it's honored.

There's a strand of biblical theology that ties suffering to covenant violation. Exodus 15:26 suggests God withholds disease from those who obey divine commandments Exodus 15:26, and Psalms 78:50 describes God unleashing pestilence as a consequence of communal faithlessness Psalms 78:50. Medieval commentator Nachmanides (13th century) developed this into a framework where illness signals spiritual distance from God.

But Ezekiel pushes back hard against any simplistic retributive reading. God declares plainly: "For it is not My desire that anyone shall die" Ezekiel 18:32. This verse has led modern Jewish thinkers like Rabbi Harold Kushner — whose 1981 book When Bad Things Happen to Good People remains widely read — to argue that God may not, in fact, control every instance of suffering. Kushner's position is controversial within Orthodoxy, but it reflects a genuine tension the tradition has never fully resolved.

Practically, Jewish law (halacha) treats healing as a religious obligation. The Talmud (Berakhot 60a) frames medicine as divinely sanctioned, meaning fighting cancer with every available treatment is not defying God's will — it's participating in it.

Christian theology inherits the Hebrew Bible's tension between a healing God and a world full of disease, and then layers on the New Testament's theology of redemption through suffering. Acts 26:18 frames the entire human condition as a movement "from darkness to light" and "from the power of Satan unto God" Acts 26:18, which many theologians read as acknowledging that malevolent forces — not just divine will — shape suffering in the present age.

The dominant Catholic and Protestant answer to theodicy (the problem of evil and suffering) has historically been some version of the "soul-making" argument, associated with theologian John Hick (1966, Evil and the God of Love): suffering creates the conditions for moral and spiritual growth. Cancer, on this reading, isn't willed by God so much as permitted within a world structured for human development.

There's real disagreement here, though. Prosperity gospel traditions — influential in Pentecostal and charismatic circles — lean heavily on Exodus 15:26's promise of divine healing for the obedient Exodus 15:26, sometimes implying that persistent illness reflects insufficient faith. Most mainstream theologians, including N.T. Wright and Miroslav Volf, reject this reading as both exegetically weak and pastorally harmful.

What's consistent across most Christian traditions is that God is described as a healer who ultimately defeats death — cancer included — even if that defeat isn't always visible in the present moment.

Islam's answer to why God allows cancer begins with an uncompromising assertion of divine sovereignty over life and death. The Quran states plainly: "And that it is He who causes death and gives life" Quran 53:44, and elsewhere, "when He decrees a matter, He but says to it, 'Be,' and it is" Quran 40:68. Nothing — including cancer — happens outside God's knowledge and will.

But sovereignty doesn't mean cruelty. Surah Al-Mulk (67:2) frames the entire created order, including suffering and death, as a divine test: "Who hath created life and death that He may try you which of you is best in conduct" Quran 67:2. This is a crucial theological move. Illness isn't punishment by default; it's an opportunity for sabr (patient endurance), which classical scholars like Al-Ghazali (d. 1111) described as among the highest spiritual virtues.

The Prophet Muhammad (hadith recorded in Sahih Bukhari) reportedly said that no Muslim is afflicted with hardship — even the prick of a thorn — without God expiating some of their sins through it. This means cancer, in Islamic thought, can function as a form of divine mercy, not just divine trial.

There's less internal disagreement in mainstream Sunni and Shia theology on this point than in Judaism or Christianity — divine qadar (decree) is one of the six articles of Islamic faith. That said, contemporary Muslim scholars like Tariq Ramadan acknowledge the pastoral difficulty of explaining qadar to a grieving family without it sounding callous.

Jewish scripture holds multiple voices in tension: God identifies as the healer and promises protection from diseases in covenantal fidelity Exodus 15:26, yet the Psalms remember times when God “gave them over to pestilence,” linking calamity to judgment Psalms 78:50.

At the same time, God declares He does not desire anyone’s death, calling for repentance and life, which tempers retributive readings of illness Ezekiel 18:32.

The Book of Job preserves faithful protest: the sufferer asks why life is given to those in bitter anguish, resisting simplistic theodicies while still addressing God Job 3:20.

Christians read the Hebrew Scriptures’ portrait of God as healer within covenant as part of their canon, acknowledging promises of protection from diseases alongside Israel’s historical experiences of judgment Exodus 15:26Psalms 78:50.

In the New Testament, suffering is a setting where people are called to turn from darkness and the power of Satan to God, to receive forgiveness and a sanctifying inheritance, emphasizing moral and spiritual transformation amid affliction Acts 26:18.

Echoing Israel’s scriptures, many Christians therefore hold together divine mercy, the reality of suffering, and the call to repentance without claiming that God desires death Ezekiel 18:32.

The Qur’an states that God alone gives life and causes death, and that He created life and death to test which people excel in conduct, situating illnesses like cancer within a wider moral trial under divine sovereignty Quran 53:44Quran 67:2.

God’s decree is effortless—He says “Be,” and it is—so nothing, including sickness and healing, lies outside His will, even as He is described as Forgiving, which frames trials with mercy and purpose Quran 40:68Quran 67:2.