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Calcium deficiency, medically known as hypocalcemia, occurs when the body does not receive enough calcium to maintain strong bones, proper muscle function, and healthy nerve signaling. Calcium is a vital mineral responsible for building and maintaining bones and teeth, supporting muscle contractions, regulating heart rhythm, and enabling proper blood clotting. When calcium levels become low, the body begins to draw calcium from bones to maintain essential functions, which can gradually weaken bone density.

Common causes of calcium deficiency include inadequate dietary intake, vitamin D deficiency, hormonal imbalances, certain medications, and digestive disorders that affect nutrient absorption. People who avoid dairy products, older adults, and postmenopausal women are at higher risk because calcium absorption tends to decrease with age.

Symptoms of calcium deficiency may develop slowly and include muscle cramps, brittle nails, fatigue, numbness or tingling in fingers, and frequent bone fractures. In severe cases, it may lead to osteoporosis, abnormal heart rhythms, or neurological issues.

Preventing calcium deficiency involves consuming calcium-rich foods such as milk, yogurt, cheese, leafy green vegetables, almonds, and fortified cereals. Adequate vitamin D intake, regular sunlight exposure, and balanced nutrition also improve calcium absorption. In some cases, doctors may recommend calcium supplements to maintain optimal levels and support long-term bone health.