Thanks for being with us.
As your thalliun scan,treadmill test and coronary angiography
are normal ,it is unlikely to get symptoms due to coronary artery
Get physician's opinion to rule out another causes of breathlessness.
Such symptoms can be seen in:
1.obstructive airway disease
6.interstitial lung disease
Though the possibility is very less but its better to get evaluate on time
Hope this will help you better.
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Wish you good health.