1, inappropriate mask size: too small or too large mask will lead to poor sealing and affect oxygen supply and breathing comfort. Be sure to choose a mask of the right size and wear it correctly.
2. The mask is not installed correctly: the mask needs to be installed correctly on the nose and mouth to ensure full contact and sealing. Please read the relevant instructions carefully and wear a mask in the right way.
3. Insufficient oxygen supply to the mask: insufficient oxygen source connected to the mask leads to difficulty in breathing. Ensure that the oxygen source is sufficient and well connected with the mask.
4. Individual reasons: Some individuals have other breathing problems or health conditions, which makes it difficult to breathe when using masks. In this case, please consult a doctor and seek a suitable solution.