Low calcium levels (hypocalcemia) can be seen in various cancers, particularly those associated with bone metastases. When cancer spreads to the bones, it can disrupt normal bone metabolism and lead to the release of calcium from the bones into the bloodstream, resulting in low calcium levels. Cancers commonly associated with bone metastases and potential hypocalcemia include breast cancer, lung cancer, prostate cancer, multiple myeloma, and certain types of advanced cancers. It's important to note that the impact on calcium levels can vary depending on the extent of bone involvement and individual factors. Consultation with a healthcare professional is crucial for the diagnosis and management of cancer-related calcium imbalances.