When the sun is out and the grass pollen count is high, many of us reach for an antihistamine to avoid the streaming eyes and constant sneezing of hay fever that can easily ruin outdoor picnics and ...

Some antihistamines can cross the blood-brain barrier – a membrane that’s supposed to protect harmful substances from getting in - Getty If you’re blighted by hay fever or other allergies, you ...

This week, UK searches for "Pollen Count" have hit a six-month peak, with queries such as "how quickly do antihistamines work" dominating search trends. The Met Office has declared the start of hay ...