Hi doc. I have been having cattarrh continuously...

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What are the causes?

1. Allergic rhinitis
2. Allergy to smoke, dust, perfume
3. Allergy to certain food
4. Stress
5. Flu
6. Post nasal drip

What is the treatment?

1. Warm drinks
2. Vitamin C 
3. Antihistamine drugs like allerfin
4. Nasal spray like vibrocil
5. Menthol water vapor

What are the investigations?

1. Physical examination
2. Blood test (CBC)
3. Chest x-ray
4. Allergy tests
Usually catarrh resolves after 2-3 weeks, if it lasts longer it is a sign that there is an underlying cause, most probably is viral infection, or allergy to a type of food or smoke or perfume. 

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Kind Regards