Did We not open up and expand your breast for you and remove your load from you which weighed down your back? Did We not raise your renown high? For truly with hardship comes ease; truly with hardship comes ease. (Qur'an, 94:1-6)
In order for it to survive and function, every organ needs to be nourished by means of the blood. Blood flows to the heart through the coronary artery. In cases of hardening of the arteries (atherosclerosis), narrowing and blockages can arise in these arteries. When the condition progresses, the passage of the blood is obstructed and the heart receives insufficient supply. This leads to chest pains, which show that the heart is unable to function properly and also to heart attacks.
The expression "Alam nashrah laka sadraka" in the above verse-translated as "Did we not open up and expand your breast for you…"-may be a sign of heart disorders of this kind and present-day coronary by-pass surgery. (Allah knows best.) That is because the first meaning of the term "lam nashrah" expresses the verb "to cut open flesh and similar substances." Indeed, in such operations, the heart is accessed by splitting the breastbone in two. As a result of the operation, the blood is enabled to flow again and chest pain is eliminated. The term "expand" in the above verse may be a sign of the removal of such congestion of the arteries.
Furthermore, it is most wise that immediately after this Sura Allah should swear by the olive, which is so beneficial to the heart. (Qur'an, 95:1)