Complications and risks of sinusitis

Most sinusitis clears without problems. Complications are uncommon, but they can be serious when the infection spreads beyond the sinuses. Early treatment and attention to warning signs reduce the risk.

Chronic sinusitis Acute inflammation that does not settle can become chronic sinusitis, with long-term blockage, facial pressure, loss of smell and poor sleep. Nasal polyps may form.

Spread to nearby structures

• Orbital cellulitis or abscess: infection spreads to the tissues around the eye, causing swelling, redness, pain on eye movement, bulging eye and vision changes. This needs emergency care.
• Osteomyelitis: infection of the facial or skull bones, such as the forehead (Pott's puffy tumour), with swelling and fever.
• Meningitis or brain abscess: very rare, causing severe headache, neck stiffness, high fever, vomiting, confusion or seizures. Call 112.
• Cavernous sinus thrombosis: a rare, life-threatening blood clot behind the eye.

Effects on daily life

• Loss or reduced sense of smell and taste, which may be temporary or lasting.
• Poor sleep, tiredness and low mood.
• Frequent headaches and missed school or work.
• Repeated antibiotic use may cause side effects and resistance.