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. Perennial allergies generally refer to symptoms caused by indoor allergens, although people with perennial allergies often suffer from seasonal pollens as well. The three most common causes of year-round allergies are dust mites, mold spores, and the saliva and dander of household pets. Dust and dust mites are everywhere, regardless of how meticulous a housekeeper you are. Dust mites feed on skin flakes shed by humans and hide under furniture, on shelves, and in rugs, mattresses, pillows, blinds, and curtains.