Dysgeusia or a metallic taste is a taste disorder that may develop suddenly or gradually. Many factors can affect the interaction of taste buds and olfactory nerve cells, altering the sense of smell and taste. In healthy individuals, dysgeusia is typically temporary and not a sign of an underlying health problem. In some cases, however, a metallic taste combined with other symptoms indicates a serious condition.
Sometimes, the immune system responds abnormally to components in food, triggering an allergic reaction. Food allergy symptoms are unpredictable and vary greatly; a metallic taste in the mouth is a common one. If dysgeusia occurs in addition to swelling, stomach upset, nasal congestion, or lightheadedness, it could be a sign of anaphylaxis, which requires immediate treatment.
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