Well, yes, seasonal allergies can cause your eyes to swell. You should know that when you have seasonal allergies, there will have some influences on your eyes, for it can just lead to disorder in your eyes, and even weaken your eyes. For example, it can just lead to swelling eyes. As we know that a more serious allergic reaction might include swelling around they eyes or mouth, or trouble breathing. So your situation, I suggest you should go and see a doctor as soon as possible.
Well, as a matter of fact, I used to have the same problem with you, I suffered from allergic sinus infection which is also seasonal. So, you should know that sometimes allergies are resulted from an impaired immune system which could be fixed through medicine pills and physical exercise. Seasonal allergies also have something to do with temperature, humidity as well as some allergic sources.
Yes, it is possible for you to get swelling eyes because of seasonal allergies because of the disorder work in the eye nerves under the weak eye skins. It is happened between the big or warm wet season when the temperature difference is happened in every climate transformation. Many people often have skin allergy phenomenon due to various environmental factors, the air distribution of bacterial spores and pollen sensitizer which will release a large number of almost all the compound histamine of organizations in the human body. People with seasonal allergies may have congestion, sneezing, runny nose, throat itching, eyelid phenomenon and so on. Some people may even get the swelling phenomenon in the skin all over the body, including the eyes part. That is why a lot of people suffering from the seasonal allergies may have the swelling eyes. The eyes will feel dry which may even become red. You could use the eye drops to release the symptom. You could use some medical treatment to release the symptom. What's more, you could eat more food with vitamin C to moisture the eyes.