Snoring and sometimes breath holding may be caused by obstructive sleep apnea syndrome, suffering from chronic rhinitis, sinusitis, nasal polyps and other diseases will appear such a situation, it is recommended to consult a doctor in time to carry out the relevant examination. 1. Chronic rhinitis: patients may suffer from nasal congestion, increased nasal secretions, causing narrowing of the nasal passages, leading to open-mouth breathing during sleep, and some patients snore and sometimes hold their breath. 2. Sinusitis: this symptom may also be caused by sinusitis, suffering from such diseases will appear nasal congestion, headache, facial distension and other adverse symptoms, the nasal cavity will appear a large number of purulent secretions blocking the nasal passages and cause disease. 3. Nasal polyps: Nasal polyps can also lead to the emergence of such a situation, the patient will usually appear severe nasal congestion, will lead to breathlessness, runny nose and other adverse symptoms, with the development of the disease, some of the polyps larger patients will be blocked in the nasal cavity, which will lead to breathing difficulties. Such discomfort requires prompt medical attention. After diagnosing the cause of the disease through examination, the patient should choose the appropriate treatment under the guidance of the doctor.