What causes nausea?

Nausea, many reasons, may be peptic ulcer, but also can be dyspepsia, reflux esophagitis, reflux pharyngitis, etc., some may be related to eating, such as eating difficult to digest food, eating cold or spicy food, very few because smoking caused chronic pharyngitis nausea. In this case, the need for regular diet, eating easily digestible food, while not smoking. If still not relieved, you can take omeprazole capsules.