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COPD does not cause stomach acid to increase. But stomach acid can aggravate COPD and cause flare ups. Several things can help. Contact your medical team for help in controlling stomach acid or GERD. Do no lay down for at least 2-3 hours after eating. Raise the upper part of your body for laying down or sleeping with either extra pillows, a wedge, or an adjustable bed to keep stomach acids where they belong and help prevent GERD symptoms. But first and foremost, contact your medical team to help control stomach acid problems. Take care and God Bless!