If your symptoms and medical history do not suggest an obvious cause, you may need to have further tests to check if your symptoms could be caused by an allergy. This is because the symptoms of allergic rhinitis can be very similar to those of non-allergic rhinitis.
Your GP may carry out a blood test to check if you have an allergy, or they may refer you to a hospital allergy clinic for more specific tests.
One of the main tests you may have at an allergy clinic is a "skin prick test". This is where your skin is pricked with a tiny amount of a suspected allergen to see if it reacts by becoming red, raised and itchy.
If the test results suggest you do not have an allergy, you may be diagnosed with non-allergic rhinitis.
Read more about allergy tests.
Specifically, examination with an endoscope is usually necessary. This is when a thin tube with a light source and video camera at one end is inserted up your nose to see inside it.
Other tests may include:
- a nasal inspiratory flow test – where a small device is placed over your mouth and nose to measures the airflow when you inhale through your nose
- a CT scan – a type of scan that uses X-rays and a computer to create detailed images of the inside of the body