Anthuriums aren't particularly dangerous topically, but they are known to cause problems for people who ingest them. They contain calcium oxalate. The most common symptoms include stomach ache, nausea, vomiting, diarrhea, and skin rashes. In rare instances, anthurium poisoning has led to death. It's important to know how to identify and treat anthurium toxicity, so you won't end up harming yourself or others.