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When the diameter of the blood vessel becomes narrowed by approximately more than 70%, the heart does not get adequate blood supply, especially when the demand of blood supply increases, e.g., While doing strenuous activity, after heavy meals or when there is stress. The person experiences pressure or heaviness or burning in the chest with uneasiness and / or restlessness. This is called ‘angina pectoris’. When the narrowing of coronary arteries takes place at a slow rate, the heart gets time to adjust to this new situation of scarcity. In some cases, new micro arteries crop up from the arteries ahead of the block and get attached to the artery after the block and thus called ‘Collateral Arteries’ or ‘Natural Bypass’. Just as the vehicle pliers go out of the main route and join it again when there is a big pit on the road !