Following an oral intake of extremely high doses of zinc (where 300 mg Zn/d - 20 times the US RDA - is a "low intake" overdose[REF]), nausea, vomiting, pain, cramps and diarrhea may occur [REF].
There is also a condition called the "zinc shakes" or "zinc chills" or metal fume fever that can be induced by the inhalation of freshly formed zinc oxide formed during the welding of galvanized materials [REF].