A metallic taste in the mouth may be related to physiologic and pathologic factors, such as pregnancy, exposure to metallic materials, and gingivitis. 1. Physiological reasons. Pregnancy: Hormone levels will change during pregnancy, which may cause abnormal taste manifestations, which can be manifested as a metallic taste in the mouth, which is a normal physiological phenomenon. Exposure to metal materials: can be due to wear dentures containing metal materials, braces and other items, long-term contact with metal may appear in the mouth with a metallic taste. 2. Pathological causes: Gingivitis: it can be caused by improper oral cleaning and other reasons that lead to gingivitis and other diseases, causing bleeding gums, which can lead to a fishy or metallic taste in the mouth. There are many other reasons that can lead to the phenomenon of metallic taste in the mouth, it is recommended that such patients go to a regular hospital, consult a professional doctor, cooperate with the doctor to complete the relevant examination, to clarify the cause, to avoid blind treatment.