If a small amount of limescale is eaten, it is not harmful to the body. But if you eat limescale in large amounts or for a long time, it will cause some harm to your body. Limescale is usually composed of mineral salt precipitates, usually calcium carbonate, calcium sulfate, magnesium hydroxide and other insoluble compounds, so if a small amount of limescale is taken by mistake, it will not do any harm to the body briefly. However, if a large amount of limescale is consumed for a long time, it will cause different degrees of damage to the body. For example, it can cause abdominal pain, bloating, nausea, vomiting, and even colic around the umbilicus and bloody stools due to excessive intake of mineral components in the digestive system. In severe cases, it can also affect the circulatory system, leading to arrhythmia, tachycardia and even dyspnea, chest tightness, shortness of breath, palpitations, dizziness, headache and other physical discomfort.