There are many reasons for nasal speech, such as sinusitis, acute rhinitis, and structural abnormalities in the nasal cavity. 1. Sinusitis: The inflammatory reaction of sinusitis will produce a lot of secretions, which accumulate in the sinuses and cause swelling of the sinus mucosa and nasal mucosa, so it will show a nasal voice, accompanied by nasal congestion, runny nose and other phenomena. 2. Acute rhinitis: Acute rhinitis is a common factor in nasal voice, due to nasal congestion, nasal secretions increase nasal voice phenomenon, accompanied by symptoms such as runny nose. 3. Abnormal nasal structure: Deviated nasal septum, nasal polyps, hypertrophy of the nasal turbinate and other diseases can lead to abnormalities in the internal structure of the nasal cavity, which can lead to the phenomenon of nasal speech. There are many reasons for nasal voice, such as nasal cavity, sinus tumors, congenital nasal cavity structural abnormalities, cleft palate, soft palate paralysis, etc. After the symptoms appear, you should go to the hospital in time to improve the examination and give standardized treatment after a clear diagnosis.