Why do I get throat irritation?

Is there any test, which can help me find out the cause of irritation in my throat when I am in office? I feel okay when not in office but as soon as I enter the office premises I start getting irritation in my throat.

 

Since you cough in office only it is likely to be environmental factor. Do you sit alone in a room or sit with a group of people? If for you sit alone in a room or cabin, then you may check for room temperature and humidity, insecticide or room freshener spray, flower vase and carpet.
If you sit with a group of people, then check for perfumes used by your colleagues. If none of above works, then get yourself tested for IgE antibody.