If a person has a bitter taste in his mouth when he eats, then he may have GERD, dental or gum problems, mouth yeast infection, respiratory tract infection, dehydration or an autoimmune condition according to WebMD and the Telegraph. GERD is a gastroesophageal reflux disease that causes symptoms of heartburn, chest pain, trouble swallowing, nausea and extra saliva with a bitter taste, according to WebMD.
To determine the exact cause of a bitter taste in the mouth, a consultation with a physician is required. Following a consultation, an appropriate treatment plan can be devised based on individual symptoms.
For those suffering with acid reflux, there are several things that can be done at home to help with the bitter taste and other symptoms. One of these is losing weight. A person that loses at least 10 percent of his body fat can see a reduction in all acid reflux symptoms. Going on a special anti-reflux diet is also a viable option that tends to work for 30 percent of those struggling with acid reflux. A glass of warm water and fresh lemon juice in the morning can also help the body balance its acidic levels, according to MNN.