- Acute: Acute sinusitis lasts for less than six months, and it is usually caused by a bacteria infection. Most cases of sinusitis are acute. When symptoms last between four and eight weeks, the condition is considered to be subacute.
- Chronic: Symptoms of chronic sinusitis last eight weeks or longer and the severity varies. Symptoms for acute and chronic sinusitis are very similar, except chronic sinusitis symptoms last longer and often cause more fatigue. According to the CDC, chronic sinusitis affects nearly 35 million people in the United States.
When an individual suffers from three or more episodes of acute sinusitis per year, the condition is referred to as recurrent sinusitis.
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