Nasal congestion, runny nose and sneezing may be allergic rhinitis, but also may be caused by sinusitis, chronic rhinitis and other diseases. 1. Allergic rhinitis: allergic rhinitis is mainly caused by a combination of genes, environment and other factors, and may also be caused by heredity. Patients will have symptoms such as itchy nose, paroxysmal sneezing, nasal congestion and watery nasal discharge. 2. Sinusitis: Sinusitis is mostly caused by upper respiratory tract infections, acute rhinitis, etc. Patients mainly manifest nasal congestion, pus, cough, headache, etc., and some of the patients have the symptom of sneezing. 3. Chronic rhinitis: chronic rhinitis is considered to be due to the body’s own immune system disorders, anatomical structure abnormalities, infections, medications and other factors, the patient’s typical symptoms of nasal congestion, runny nose, headache, etc., and some patients also have the performance of sneezing. When patients have symptoms of nasal congestion, runny nose and sneezing, there are also other diseases. It is recommended that patients consult a doctor in time to check the cause of the disease, and follow the doctor’s instructions for treatment.