The Science of High altitude
When we go to very high places — like mountains or airplanes — the oxygen levels drop. At high altitudes, our body breathes faster, and the chest muscles, including the diaphragm, work harder. This causes tightness in the chest (muscles strained).
If these muscles can’t move freely, the chest cavity can’t fully expand — the lungs can’t fill with enough air, leading to a constricted feeling and shortness of breath.This leads to a condition called hypoxia — insufficient oxygen reaching the body’s tissues due to reduced oxygen levels.
More than 1,447 years ago, the Quran described this exact phenomenon in two words — tight and constricted:
"…He makes his chest tight and constricted as if he were climbing into the sky…" (Quran 6:125)
The physical reality of a disbeliever who finds it difficult to accept the truth is compared to a person climbing to the extreme heights of mountains or ascending into the sky, who finds it extremely difficult to breathe due to the tightening and constriction of the chest.
“And whoever Allah wills to guide — He opens his chest to Islam; and whoever He wills to let go astray — He makes his chest tight and constricted as though he were climbing into the sky.”
(Qur’an 6:125)
The verse uses two precise Arabic words:
Ḥarajan (حَرَجًا) – tightness, difficulty.
Ḍayyiqan (ضَيِّقًا) – constricted, squeezed.
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