Acute Sinusitis

• Recurring, or rebound sinus infections can be expected with uncomplicated cases of acute sinusitis, which occurs up to three times per year and can last up to eight weeks with each occurrence. Medication should be taken with each sinus infection.
  
  

Chronic Sinusitis

• Chronic sinusitis can occur when a sinus infection is not treated quickly and thoroughly. This can result in rebound infections up to four times per year, lasting up to twenty days. Chronic sinusitis sufferers have sinus infections regularly.
  
  

Resistance to Treatment

• According to eMedicineHealth, people who have several episodes of acute sinusitis that aren't treated fully, or people with chronic sinusitis can become resistant to amoxicillin, one of the main prescriptions drugs used against sinusitis. In this case, newer synthetic penicillins may be recommended.
  
  

Other Causes

• Sinusitis can also be caused by viruses, structural issues pertaining to the nasal passage, and allergies. Get a check up to learn the cause of the infection, especially for one that has lasted a long time.
  
  

Preventing Rebound Cases

• The best way to tackle a sinus infection and keep it from coming back is to take the full course of a simple antibiotic, such as amoxicillin, for the entire duration it is prescribed. This will usually last beyond the duration of the symptoms.