Fishy taste in the mouth may be eating food with a fishy taste or the internal tissues of the mouth is damaged or inflammation triggered by bleeding, specific need to go to the hospital for examination. 1. Fishy food: fishy taste in the mouth may be the diet of seafood such as fish and shrimp with fishy food, generally through brushing can remove the fishy taste. 2. Oral injury: fishy taste in the mouth may also be too hard to eat and drink too stimulating food, or there are bad restorations over the sharp tip of the tooth, the root of the tooth scratches the oral mucosa, causing the mucous membrane to bleed, resulting in the mouth with a bloody flavor. 3. Oral inflammation: long-term chronic periodontitis or periapical periodontitis, mumps and other oral inflammation, abnormal exudation of fluids can be accompanied by blood exudation, the mouth will also have a fishy taste. The mouth has a fishy odor specific to the hospital to do a complete examination of the oral cavity, in order to determine the cause of the fishy odor, and then targeted treatment.