Taste disorder is a condition in which a person is unable to taste certain foods or beverages. It can range from a mild change in taste to a complete loss of taste. Symptoms may include a metallic or bitter taste in the mouth, a lack of appetite, or difficulty distinguishing between sweet and sour. The condition can develop suddenly or gradually, and can be caused by a range of medical conditions, medications, and environmental factors. Depending on the cause, treatment may involve dietary changes, medications, or lifestyle modifications.