Calcium deficiency, also known as hypocalcemia, occurs when the body doesn’t get enough calcium to support vital functions. Calcium is essential for strong bones and teeth, muscle movement, nerve signaling, and heart health. When levels are low, symptoms may include brittle nails, muscle cramps, tingling in the fingers, fatigue, or even bone fractures over time. Seniors, postmenopausal women, and those with limited dairy intake are at higher risk. Long-term deficiency can contribute to osteoporosis, making bones weak and fragile. Including calcium-rich foods such as dairy, leafy greens, fortified plant-based milks, and fish with soft bones can help prevent it.