Bilateral sieve sinusitis, whether it is a bacterial infection or fungal infection, need to be combined with medical history, clinical symptoms, auxiliary examination to determine. 1. Medical history: Long-term use of antibiotics, diabetes, immune disorders, immunosuppressive drugs and other medical history are high risk factors for fungal infections. 2. Clinical symptoms: Bilateral sieve sinusitis caused by fungal infection may result in pus and blood nasal discharge, and recurrent runny nose and other symptoms, and the use of nasal irrigation treatment, the symptoms have not been reduced or aggravated. 3. Auxiliary examination: Fungal culture of nasal secretion can be carried out to clarify the fungal infection, and CT examination can often find fungal mass growth in the sinus cavity, which may be shown as a high-density calcified spots, and serious bone destruction can be seen. With bilateral sieve sinusitis, you need to actively seek medical advice and follow the doctor’s instructions for examination, to clarify the cause of the active treatment.