Low calcium levels can lead to muscle aches, cramps, and bone discomfort, which may be felt as neck pain. This is often linked to vitamin D deficiency, since vitamin D helps your body absorb calcium properly. Other possible causes include poor diet, long-term stress on neck muscles (like bad posture or screen use), or, rarely, hormonal issues like parathyroid problems. Improving your calcium and vitamin D levels through diet or supplements, along with proper posture and gentle neck exercises, usually helps. If the pain persists or is severe, consult a doctor for further evaluation.