Signs of a nutrient deficiency can vary, but common indicators include fatigue, weakness, and skin issues. Specific symptoms may relate to the lacking nutrient; for instance, iron deficiency often leads to anemia, characterized by breathlessness and dizziness. In contrast, vitamin D deficiency can result in bone pain and muscle weakness. Other signs include hair loss, digestive issues, and impaired immune function. If anyone notices these symptoms, consulting a healthcare provider for appropriate testing and intervention is crucial.