Sinusitis is usually due to an infection, although swelling from allergies can mimic the symptoms of pressure, pain, and congestion, and allergies can set the stage for a bacterial infection.
Streptococci, meningococci, and Haemophilus influenzae, organisms that cause diseases such as otitis media, sinusitis, pneumonia, meningitis, osteomyelitis, septic arthritis, and sepsis, all make capsules.
Some children and adults have few episodes of heart-burn over their lifetimes, but they have frequent bouts of ear infection, sinusitis, bronchitis, and even asthma.
Post-nasal drip, the irritating trickle of mucus from the nasal passages into the throat caused by allergies or sinusitis, can also result in a cough.
Once asthma is present, symptoms can be triggered or made worse if the child also has rhinitis (inflammation of the lining of the nose) or sinusitis.