Back to top 2. Watery, itchy eyes, sneezing, constant runny nose, and skin rash are some of the most common symptoms, but allergic reactions can occur in just about any part of the body. Back to top 3. Back to top 4. Yes, but we don't know why.
Genes clearly play a role.
If one of your parents has allergies, you're at increased risk of developing them, too. If both parents have them - even if they're not allergic to the same things your chances skyrocket. And if you have asthma, you're at a significantly higher risk of developing allergies, and vice versa. Back to top 5. Back to top 6.