Cacogeusia is the medical term for a persistent unpleasant taste in the mouth. It can arise from poor oral hygiene, gum disease, sinus infections, acid reflux, or medications including some antibiotics and antihypertensives. Nutritional deficiencies, particularly of zinc, are a recognised cause, since zinc supports taste-bud function. Pregnancy, smoking, and dry mouth also distort taste perception. Because eating becomes less enjoyable, prolonged cacogeusia can reduce food intake and nutritional status, especially in older adults. Management targets the underlying cause: treating infection, reviewing drugs, correcting deficiencies, and improving oral hygiene and saliva flow.