You cant hide from seasonal pollen. Its a plants method of fertilisation and without it, many will die out. Around one fifth of the UK population has some sort of allergy or intolerance and a reaction to pollen is one of the most common problems. Hay fever; as many sufferers know, is more than just an irritation. It can cause numerous debilitating effects including sneezing, blocked nose, watery eyes, lethargy, headaches, sore throat, coughing and even asthma. There's no doubt that allergies pose a big problem for sufferers.