Oral calcium tablets do have some side effects and there is no problem with taking them when the organism is deficient in calcium. If the body is not deficient in calcium and oral calcium tablets are taken, it will lead to an increase in the level of calcium ions in the blood, which will lead to the formation of hypercalcemia. Hypercalcemia has very many side effects, for example, it can lead to urological pathology, especially prone to the formation of urinary stones, such as kidney stones, ureteral stones, bladder stones, etc., which can cause acute and severe pain during an acute attack. In addition, hypercalcemia can trigger digestive disorders, such as digestive abnormalities, stomach pain, and even the development of ulcers. Hypercalcemia can also have an effect on the nervous system, such as the development of headaches, fatigue and other symptoms, so oral calcium tablets should also be appropriate, not too much.