Symptoms of vitamin D deficiency can include fatigue, muscle weakness, and bone pain. Individuals may experience a higher risk of fractures and conditions such as osteomalacia or osteoporosis. Other signs may include mood changes or an increased likelihood of developing autoimmune diseases. Since vitamin D is crucial for calcium absorption and bone health, maintaining adequate levels through sun exposure, diet, or supplementation is essential for overall well-being. Recognizing these symptoms early can help in seeking appropriate treatment and restoring optimal vitamin D levels.