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on effort is angina
- unless proved otherwise.
It very often happens suddenly only. There won't be any symptom till about 70% of the artery
is blocked. At this level, a complete block may occur - from rupture of the plaque, clot, spasm and so on - resulting in heart attack
. Slower progression causes pain only on effort - disproportion between demand and supply, due to the narrowing.
You should see a cardiologist immediately
Wishing speedy recovery