Dry mouth and bitter mouth can be caused by oral diseases, or it can be a manifestation of systemic diseases in the oral cavity.
Oral diseases such as apical inflammation of the teeth, gingivitis or periodontitis, inflammation will appear when the presence of dry mouth and bitter, systemic diseases such as colds and fevers will appear in the dry mouth and bitter, in the cold after the natural disappearance of the symptoms. Diseases of the hepatobiliary system or gastrointestinal tract can also cause dry mouth and bitterness, and bile reflux can cause a bitter taste in the mouth in the morning.
In addition, diabetes, high blood pressure or endocrine disorders can also cause dry mouth and bitter mouth.
Therefore, the first thing to do is to find out the cause of dry mouth and bitterness, you can go to the stomatology department to rule out the local causes, and the systemic factors can go to the gastroenterology department or the endocrinology department to consult a doctor.