WEBApr 12, 2023 · Symptoms of ricin poisoning depend on whether a person breathes in the ricin, eats it or gets it in a shot. When breathed in, ricin causes fever, chest tightness, cough and breathing problems. Ricin can cause a fluid buildup in the lungs, known as pulmonary edema. If ricin is eaten, it can cause vomiting and diarrhea.