Allergic rhinitis typically causes cold-like symptoms, such as sneezing, itchiness and a blocked or runny nose. These symptoms usually start soon after being exposed to an allergen. Some people only get allergic rhinitis for a few months at a time because they're sensitive to seasonal allergens, such as tree or grass pollen. Other people get allergic rhinitis all year round. Most people with allergic rhinitis have mild symptoms that can be easily and effectively treated. But for some symptoms can be severe and persistent, causing sleep problems and interfering with everyday life. The symptoms of allergic rhinitis occasionally improve with time, but this can take many years and it's unlikely that the condition will disappear completely