Depending on your sensitivities, symptoms may start as early as March, when tree pollination begins, and go as late as November, which usually is the end of ragweed pollination. These allergies fade quickly when the plants you are sensitive to stop pollinating. Often there is a family history of seasonal allergies. If you are a seasonal allergy sufferer, you can probably predict the times you will experience symptoms and take steps to minimize their effects. Often there are mild symptoms between seasons.
Symptoms experienced by the sufferer are similar to the seasonal variety.
Often minor symptoms occur between major allergy attacks. Some people have both seasonal and perennial allergic rhinitis, with perennial symptoms getting worse during pollen seasons. The symptoms of the two types are basically the same but seasonal symptoms are worse outdoors while perennial symptoms are worse indoors. Some people never suffer from allergies at all. Some endure the seasonal types that last a few months, then fade away until the next year.