If my phosphorus is low (2.0 mg/dl) , what does that mean low phosphorus?

Low phosphorus: Low phosphorous levels can be caused by taking too many antacids containing magnesium or aluminum hydroxide,by over active parathyroid activity,uncontrolled diabetes, malignancy spreading to bones, malnutrition. An endocrinologist can evaluate and advise you further. Appropriate testing will be done.

Nothing by itself: One low phosphorus reading means nothing by itself. it should be rechecked in 4 weeks. Symptoms of hypophosphatemia occur only when the phosphate level in blood becomes very low for a while. Muscle weakness can develop. In mild chronic hypophosphatemia, the bones can weaken, resulting in bone pain and fractures. People may also lose their appetite.