Hello The metallic taste that you have in your mouth can be associated with a variety of factors that can range from cancer, allergies to diseases such as kidney failure, pregnancy, dental problems, deficiency in certain vitamins, and more. Disorders of the nervous system can also cause you to have an altered sense of taste. Nervous system disorders affect how your nerves send messages to the rest of your body. How to treat this? 1. Most often, lifestyle changes are all you need to improve your sense of taste. If you are a smoker, quit smoking to taste your food fully. 2. Proper dental hygiene can also reverse impaired sense of taste. 3. Through brushing and flossing, you can eliminate plaque from your mouth, protect your teeth from disease and decay, and help regain your full sense of taste. Bacterial sinusitis, salivary glands, and throat infections can be treated with antibiotics. Symptoms of colds, flu, and allergic rhinitis that impact taste may be relieved with decongestants or antihistamines. Once you are feeling better, your taste will most likely return quickly. Hope this helps. Please write back for further queries. Wishing you good health.