I use tums for heartburn quite regularly. Over the last few months my heartburn appears to have increased, both in frequency and in severity. Heartburn is a very unpleasant sensation, especially when it keeps you from sleeping. So whenever I feel I need one, I use a tum. A colleague warned me about taking too many tums when she saw me take one at work. She says there are long term side effects, even if I don't notice any right away. Is there any truth in that? Would someone explain this to me?