What is the definition or description of: thistle allergy?

Milk Thistle allergy: "Milk thistle may cause allergic skin reactions, bloating, blood clots, collapse, constipation, decreased platelets, diarrhea, eczema, elevated liver enzymes, fever, gas, giddiness, headache, heart attack, heartburn, high bilirubin (a toxic substance) in the blood, hives, impotence, increased creatinine, increased lactate dehydrogenase level, infection, insomnia, irritability, itching, joint pain,