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Gum disease is a very common condition where the gums become swollen, sore or infected. The gums tend to bleed after you brush or floss your teeth, and the blood in your mouth causes the metallic taste. If left untreated, the tissues and bone that support the teeth can also become affected (known as periodontitis).
Bleeding gums is the most common cause of a metal taste. Infection in the mouth and gingivitis, or gum disease, are localised causes but there might be an underlying more general cause, such as pregnancy causing hormonal changes, or an illness such as kidney stones, heart failure, diabetes or cancer. Toxicity from a poison such as lead or mercury is another possibility.