A 26-year-old woman became severely ill after eating poisonous mountain mushrooms she mistakenly thought were edible. She developed serious heart problems, elevated liver enzymes, and inflammation of the pancreas, requiring intensive care and a heart defibrillator shock. After receiving NAC (N-acetylcysteine) infusions and dialysis for a week, she gradually recovered and was eventually discharged in good condition. This case highlights the dangers of wild mushroom foraging and the importance of seeking immediate medical attention if poisoning is suspected.