What Are Red Tides?
Red tides in the Gulf of Mexico are caused by Karenia brevis, which has toxins that can be harmful to humans. Most people experience red tide toxins as minor respiratory irritation — coughing, sneezing, teary eyes and an itchy throat. Typically, these symptoms go away when they leave the beach.
But people with chronic lung problems like asthma and chronic obstructive pulmonary disease (COPD) can have more severe reactions when they breathe in airborne red tide toxins — even ending up in the emergency room. Health officials advise these people to avoid areas experiencing red tide altogether, take all medications as prescribed and have access to rescue inhalers. People with chronic lung disease should leave the beach if they begin experiencing respiratory problems, even if red tide is at very low or low concentrations.