Getting up in the morning and spitting yellow may be due to pregnancy, GERD, periodontitis and other reasons. 1. Usually after a woman is pregnant, it will change the level of hormones in the psyche, which will stimulate the body and produce some early pregnancy reactions, the more common symptoms are vomiting and nausea when waking up in the morning, and if the pregnancy vomiting is serious, the phenomenon of spitting yellow water will occur. 2. Usually suffering from GERD is caused by abnormalities in esophageal acid clearance, esophageal anti-reflux barriers, and esophageal mucosal defenses, etc. The general symptoms include acid reflux, dysphagia, swallowing pain, heartburn, hoarseness, and a feeling of a foreign body in the throat. When increasing the abdominal pressure, the pharyngeal area is stimulated by the gastric contents refluxed into the oral cavity, and it is easy to produce the situation of spitting yellow water. 3. Periodontitis: patients with periodontitis often have poor oral hygiene, a large number of bacterial reproduction, coupled with food debris, may lead to get up in the morning and spit yellow phenomenon. Repeatedly get up in the morning spit is yellow, need to actively seek medical advice, follow the doctor’s instructions reasonable treatment.