过敏性鼻炎，又称为鼻敏感、干草热、花粉热、花粉症或季节性过敏性鼻炎，是因为免疫系统受到空气中的过敏原影响而导致的鼻炎症状。征兆和病症包括流鼻涕或鼻塞、打喷嚏、眼睛的红痒与溢泪、眼睛周围肿胀。从鼻腔流出的液体通常是清澈的。症状通常会在接触过敏原后的几分钟后产生，而且会影响睡眠、工作能力以及在学学生的注意力，因为花粉而有病征的患者，大概都集中在一年的特定时间发病。许多过敏性鼻炎的病患也会为气喘、过敏性结膜炎或异位性皮肤炎所苦。

过敏性鼻炎基本上是受到环境过敏原的诱发，例如花粉、动物毛发、灰尘或霉菌，遗传基因还有环境暴露都是造成过敏的原因。在农场里长大或有多个兄弟姊妹都能减低罹患过敏的机率其作用机制和IgE抗体有关，当此抗体接触到过敏原时会促使肥大细胞发布像是组织胺的化学物质来造成发炎反应。诊断方法常仰赖医疗病史，且结合皮肤过敏试验或是抽血来检查是否含有特定IgE抗体。不过这些测试有时会呈现伪阳性。过敏的病征和普通感冒的症状类似，但过敏的症状常持续超过两个礼拜而且较少会有发烧的情形。

Allergic rhinitis, also known as hay fever, is a type of inflammation in the nose which occurs when the immune system overreacts to allergens in the air. Signs and symptoms include a runny or stuffy nose, sneezing, red, itchy, and watery eyes, and swelling around the eyes. The fluid from the nose is usually clear. Symptoms onset is often within minutes following exposure and they can affect sleep, the ability to work, and the ability to concentrate at school. Those whose symptoms are due to pollen typically develop symptoms during specific times of the year. Many people with allergic rhinitis also have asthma, allergic conjunctivitis, or atopic dermatitis.