Common signs of nutrient deficiency include fatigue, weakness, and changes in hair and skin health. Specific deficiencies can manifest through various symptoms; for instance, iron deficiency may lead to anemia, causing fatigue and pallor. Vitamin D deficiency could present as bone pain and muscle weakness, while a lack of vitamin C can result in poor wound healing and scurvy symptoms. It's essential to recognize these signs early and consult a healthcare provider for proper diagnosis and treatment through dietary adjustments or supplementation.