Pediatric Treatment Recommendations Community Antibiotic See more videos old sinusitis 9 year in for sinusitis in 9 year old. Common causes of chronic sinusitis include: 1. nasal polyps. these tissue growths can block the nasal passages or sinuses. dua. deviated nasal septum. a crooked septum — the wall between the nostrils — may restrict or block sinus passages, making the symptoms of sinusitis worse. 3. other medical conditions. the complications of conditions such as cystic fibrosis, hiv and other immune system-related diseases can lead to nasal blockage. 4. respiratory tract infections. infections in your respirat Sinusitis is an inflammation of the lining of the nose and sinuses. it is a very common infection in children. viral sinusitis usually accompanies a cold. allergic sinusitis may accompany allergies such as hay fever. Chronic Sinusitis Symptoms And Causes Mayo Clinic Chronic Rhinosinusitis In Children Hindawi A runny nose, a blocked nose, mouth breathing, nasal speech...