The precautions for tracheal intubation include four aspects:

1. The existence of dentures should be excluded first. Orotracheal intubation may lead to tooth loss, and may even fall into the airway and cause suffocation;

2. The operation action needs to be gentle. Oral intubation may stimulate the vagus nerve and cause cardiac arrest. The patient's condition should be observed in time;

3. Oral intubation needs to be determined by X-ray to avoid misinsertion;

4. If the nasal cavity is intubated, it is necessary to understand the deviation of the nasal septum in advance, choose the unobstructed side of the nasal cavity, and also pay attention to whether the patient has paranasal sinusitis, sinusitis, and nasal bleeding.