Hello, my friend. Bitter mouth is mostly caused by inflammation of the liver and gallbladder. It is recommended to go to the hospital for a physical examination in Xiaohua internal medicine department to make a clear diagnosis and re-treatment. Omeprazole, domperidone and Xiaoyan Lidan tablets can also be taken orally. Avoid spicy, fried, barbecue and other hot and dry products in the diet. You can eat more cold soup, mainly cold diet, and avoid alcohol and fat in your life.