Paralytic Shellfish Poisoning (PSP) is a serious illness caused by consuming shellfish contaminated with toxins produced by certain types of algae, particularly dinoflagellates. These toxins can accumulate in shellfish like clams, mussels, and oysters, making them dangerous to eat. Symptoms of PSP can appear quickly and include tingling, numbness, and difficulty breathing. In severe cases, it can lead to paralysis and even death. To prevent PSP, it is essential to follow local advisories about shellfish harvesting and consumption, especially during harmful algal bloom events.