"I have allergies."
If you notice eye irritation while outside or around pets, you may have eye allergies. Also, if you have other allergies that you regularly treat, you may notice that your eyes get involved during peak periods such as pollen season.
This can be a twofold problem involving both your contact lenses and your eyes. Lenses may collect irritants, which then irritate your eyes. Keeping your lenses clean can help, which means possibly changing your contact lens solutions or switching to daily disposable contact lenses.
Read more about contact lens discomfort remedies.