Panther Labs Keto thick yellow or green mucus from the nose mucus that drips from the back of the throat. Sinusitis can be acute or chronic. Symptoms of acute sinusitis usually disappear within a week or 10 days. If your condition does not improve despite treatment and lasts more than 12 weeks, you may be dealing with chronic sinusitis. When should you go to the doctor? If the pain you feel is very strong, does not go away for a very long time and coexists with other symptoms