Many adults do not prioritize calcium intake as much as they should, despite its crucial role in maintaining strong bones, teeth, nails, and hair. Calcium is also essential for the proper functioning of muscles, the heart, and nerves. A deficiency, known as hypocalcemia, can manifest in ways that are not immediately obvious.
According to Dr. Damola Aje, a board-certified endocrinologist, calcium is vital for every cell in the body that needs to contract, signal, or fire. Muscles require calcium to contract and relax, and nerves need it to transmit signals. Persistent deficiency can weaken bones, increasing the risk of osteoporosis, a condition characterized by brittle bones. Aje noted that adequate calcium intake is associated with reduced risk of fractures and lower blood pressure. She has treated patients who have lost significant bone mass over decades due to unaddressed calcium deficiencies, emphasizing that prevention is far simpler than treatment.
Your body actively works to maintain normal blood calcium levels, sometimes by drawing calcium from bones. This means that a standard blood test might appear normal even when bones are being depleted. Calcium also plays a role in blood clotting and normal heart function, and its deficiency can lead to bleeding complications.
Physical signs of a calcium deficiency can include muscle cramps, twitching, or spasms, often appearing in the hands, legs, or around the mouth. Tingling or numbness in the fingers and around the mouth can also be early indicators. Longer-term insufficiency can affect tissue health, leading to brittle nails and dry, breakage-prone hair. Other physical symptoms may include dry skin, dental issues like thin or pitted teeth, general weakness, and in severe cases, cardiac rhythm abnormalities or seizures.
Neurological and cognitive symptoms are also common. Calcium is crucial for nerve signaling, and when levels drop, the brain can be affected. A decrease in calcium can make the nervous system "hyperexcitable," contributing to muscle spasms and tingling, as well as mental symptoms. People may experience fatigue, low stamina, or "brain fog," characterized by difficulty concentrating or mental sluggishness. Memory issues, mood changes, and poor sleep can also be signs. In more severe instances, confusion and neurological symptoms like psychosis and encephalopathy may occur. Persistent cognitive or mood changes, especially when accompanied by muscle cramps, tingling, or fatigue, should not be overlooked.
Addressing a calcium deficiency often requires more than just taking a calcium supplement. Vitamin D and magnesium are critical for calcium absorption and utilization. Vitamin D is essential for helping the body absorb calcium, and low vitamin D levels can lead to apparent calcium deficiency even with adequate intake. Magnesium plays a key role in regulating calcium's movement into and out of cells and in muscle relaxation. Imbalances in magnesium can mimic symptoms of calcium deficiency.
Experts recommend consulting a doctor for a full blood workup if experiencing symptoms of deficiency. This should include checking levels of vitamin D, parathyroid hormone, and potentially a 24-hour urine calcium test. While dietary changes and supplements can help, identifying the underlying cause is paramount.
The National Institutes of Health recommends 1,000 milligrams of calcium daily for adults, and 1,200 milligrams for women over 50 and men over 70. However, experts prefer calcium to be obtained primarily from whole foods, with supplements used only when medically necessary. Calcium-rich foods include leafy greens, dairy products, fortified alternatives, nuts, and seeds. The body absorbs calcium from food more readily than from supplements, as it is consumed alongside other nutrients. Taking high-dose supplements can lead to issues like kidney stones and constipation.
Weight-bearing exercise is also recommended for bone health. Bone density screening is particularly important for women approaching menopause. The silent nature of calcium deficiency, where the body prioritizes blood calcium levels over bone health, makes regular checkups and awareness of symptoms essential before significant depletion occurs.