If I were a sneaky disease, working my pathological magic through mimicry, I think I'd be vocal cord dysfunction.
What's VCD? I didn't even know it existed until last week, so don't feel embarrassed. Also known as laryngeal dysfunction, paradoxical vocal cord motion, laryngeal dyskinesia, vocal cord malfunction and a number of medicalese terms, this tricky little guy masquerades most commonly as the everyman of respiratory conditions, asthma. (And from the dawn of the 20th century to today, occasionally it's diagnosed as hysteria. It's all in your head, person who can't breathe, it's all in your head.)