Our expert says:
The most common cause for your hoarseness is probably an infection (laryngitis) or speaking with inflamed vocal cords, causing swelling of the vocal cords. It is unlikely to be dystonia and although throat cancer is a cause for hoarseness, this is usually found in smokers ( and I am guessing with asthma you did not smoke) Heartburn can cause acid irritation of even the upper airways and upper esophagus, so this is also a feasible cause. Let me know what the ENT doctor says but I don't really think you need to panic.
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