People with advanced magnesium toxicity may notice their heart beating differently. Severe low blood pressure can make a person feel like their heart is racing. There could be a sensation of skipping beats or fluttering in the chest. Conversely, a weakened heart muscle might cause a feeling like the heart is beating more slowly.
Heart palpitations may be accompanied by a feeling of pain or pressure. It's important to take changes in heartbeat seriously, as sufficiently high magnesium can cause heart attacks in some people.

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