My eyes are constantly itchy - what could be causing this and how can I get some relief?

The most obvious reason is that you are producing a chemical called histamine as part of an allergic reaction. You may be experiencing hayfever (a reaction to pollen) or you may be reacting to other irritants such as animal hair, dust mites, household cleaners, chemical air fresheners, etc. Check your environment to see what might be affecting you, especially if symptoms are quite recent and may be due to something you have recently introduced to your surroundings.

One natural remedy for allergies such as these is Pollinosan. You take the tablets with food to deal with symptoms such as itchy eyes or sore, irritated eyes.

You may also find it helpful to increase your intake of vitamin C, as this acts as a natural antihistamine, reducing many troublesome, inflammatory, itchy symptoms. Drinking nettle tea can also help reduce histamine levels.