 [ Symptoms ] for a while now i have been throwing up mucus in the mornings why is this should i be concerned [ Disease ] do you know if you have gastroesophageal reflux gerd because what you are throwing up may not be mucus but rather stomach acid that is been sitting in your esophagus all night people with acid reflux disease may not have classic symptoms of heartburn instead they may hack up yellowish mucus looking stuff in the morning though not usually via actual vomiting or exhibit tooth decay on their back molars if you are truly vomiting i would suggest you see a medical professional a number of conditions could be causing this and you can only receive an accurate diagnosis if you are examined by your primary health care provider hope this helps