2 doctors weighed in:

Pft are normal but still experiencing shortness of breath. What can be the cause? Also been having lots of mucus for a couple of months. Gerd?

2 doctors weighed in
Dr. Bennett Werner
Internal Medicine - Cardiology
1 doctor agrees

In brief: Many causes

Anemia, metabolic acidosis, thyroid excess, pulmonary embolism, pulmonary hypertension, hyperventilation, and panic attacks - none will cause abnormalities on PFTs.
Other causes will but may be minor enough that you've been told they're "normal". Moreover, some won't show on spirometry alone. You may need diffusing capacity or provocative tests to uncover them. Bottom line: you need more work up.

In brief: Many causes

Anemia, metabolic acidosis, thyroid excess, pulmonary embolism, pulmonary hypertension, hyperventilation, and panic attacks - none will cause abnormalities on PFTs.
Other causes will but may be minor enough that you've been told they're "normal". Moreover, some won't show on spirometry alone. You may need diffusing capacity or provocative tests to uncover them. Bottom line: you need more work up.
Dr. Bennett Werner
Dr. Bennett Werner
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