Gastrointestinal anthrax is rare but serious, and symptoms often include severe abdominal pain, nausea, vomiting, bloody vomiting or diarrhea, fever, and abdominal swelling, sometimes progressing rapidly to shock. It most commonly occurs after eating raw or undercooked meat from infected animals, particularly in areas where livestock vaccination and meat inspection are limited. The bacteria can infect the throat (oropharyngeal anthrax) or the intestines, leading to ulcers, bleeding, and tissue damage. Other sources are uncommon, but handling or preparing contaminated meat can increase risk if hygiene is poor. Because early symptoms can mimic food poisoning, rapid worsening and bleeding are key warning signs that distinguish it from routine gastrointestinal illness.