Excessive calcium supplementation in pregnant women may cause symptoms of cardiovascular system, digestive system and nervous system. 1. Symptoms of cardiovascular system: Pregnant women who take too much calcium supplementation may develop hypercalcemia, with symptoms such as rapid heartbeat, palpitation, fever and irritability. 2. Symptoms of the digestive system: pregnant women may experience vomiting, loss of appetite, bloating, nausea, constipation and other symptoms. 3. Nervous system symptoms: Pregnant women who take too much calcium can have symptoms such as fatigue, lethargy, drowsiness and unsteady walking. If pregnant women have clinical symptoms related to calcium oversupplementation, they need to go to the hospital as soon as possible, according to the specific condition of the doctor, to develop individualized diagnosis and treatment plan, so as not to delay the condition.