Sinus infections are usually caused by bacteria or viruses. The usual symptoms of sinus infection include: headache, facial pressure, pain around the eyes and teeth, difficulty breathing through the nose, fever and coughing. If you have sinus infection and have already used neti pot you may experience some side effects like dizziness and nausea. It is best to consult your doctor if you experience any symptoms after using neti pot. The most common cause of sinus infection is bacteria or viruses. Infections may occur after any illness or after having contact with an infected person. In order to prevent infections from spreading you should wash your hands frequently and avoid touching your eyes, nose, and mouth with unwashed hands. If you do not have access to clean drinking water you should use sterile salt water instead of tap water. You should always consult your doctor if you experience any unusual symptoms after using neti pot.