what causes acute sinusitis
Acute sinusitis only happens for a short time (usually a week), but chronic sinusitis can last for months. Sinusitis is considered chronic after at least 12 weeks of symptoms. Acute sinusitis is usually caused by a cold, but chronic sinusitis can have many other causes. Nearly 30 million Americans have sinusitis of some sort. Chronic sinusitis can make it especially hard to breathe due to long-term blockage and inflammation.