Aquagenic urticaria, also known as water allergy, is a rare condition where exposure to water triggers allergic reactions like hives. Symptoms can include itchy welts, systemic reactions, and impact daily activities. Aquagenic urticaria, also known as water allergy, is a rare condition where exposure to water triggers allergic reactions like hives. Symptoms can include itchy welts, systemic reactions, and impact daily activities. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle