DEAR DR. DONOHUE: Can you figure out what's going on with me? I have been a daily runner for a number of years. I mostly run on a treadmill in an airconditioned gym, especially in the summer months. This year, I am having breathing troubles. About six or seven minutes into my run, I start coughing and feel like there's a tight strap around my chest. I have to slow down or stop.

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