It is a good idea to see a doctor if your symptoms are severe, persistent, or accompanied by a high fever. Additionally, suppose you suspect you have sinusitis and your symptoms last longer than a week, worsen over time or are not improving with home treatment. In that case, it’s best to seek medical advice. Similarly, if your allergy symptoms are significantly impacting your quality of life or if you have recurrent sinus infections, it’s a good idea to consult with a healthcare professional.