What does it mean if everything tastes metallic?

A metallic taste is common, annoying, and usually traceable to something specific. The top of the list is medications - MedlinePlus notes taste changes are a known effect of many drugs, with antibiotics like metronidazole and clarithromycin, some blood pressure pills, and chemotherapy among the usual offenders. Right behind them: multivitamins and supplements containing zinc, iron, or copper, and even zinc-heavy cold lozenges. Next down the list: your mouth itself. Gum disease, poor dental hygiene, and mouth infections cause metallic or bad tastes, and bleeding gums literally add iron to your mouth. Then the systemic causes: colds and sinus infections dull and distort taste, reflux washes acid upward, pregnancy famously changes taste early on, and COVID is known for taste disturbances. Most metallic taste fades when the cause does - the antibiotic course ends, the cold clears, the gums heal. See a doctor or dentist if it persists past a couple of weeks with no obvious cause, comes with mouth pain or sores, or arrives with other new symptoms like numbness or smell loss. Sudden taste loss with facial weakness is urgent. In the meantime, practical help: brush your tongue when you brush your teeth, stay hydrated, and try sugar-free gum - saliva is the natural rinse that keeps odd tastes from settling in. Pymander is a free AI doctor, 24/7 by text. List your medications and it can help you spot the likely culprit.