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Originally Posted by Fotzlid
Well, bad posture could cause asthma-like symptoms. Your diaphragm is just below your lungs. If you are all scrunched over, there will be less room for it to move.
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That's an oversimplification to the point of being untrue. Yes, the diaphragm is between the thoracic cavity and the abdominal cavity, but these are both normally sealed. When you slouch your stomache bulges out to account for the loss in volume, which is why slouching can make you look like you're out of shape.
Also, the diaphragm isn't the only muscle involved in the breathing mechanism. The intercostal muscles between the ribs also play a role.
Bad posture might cause mild shortness of breath, but cannot cause the extreme difficulty breathing associated with an asthma attack without some other factor being involved.