Bronchial asthma is graded into 4 levels, mainly as follows. 1. mild, patients may have mild shortness of breath, as well as the ability to lie down and have anxiety and irritability, patients may have scattered croup, etc. 2. moderate, mostly seen in patients who prefer to sit, and have a significant increase in respiratory rate, patients may have auxiliary respiratory muscle activity, trigeminal signs. 3. severe, mostly seen in patients who have shortness of breath even when not working, and have a significant increase in respiratory rate and loud and scattered croup. 4. In severe cases, the patient may have shortness of breath even when not working, and there is an obvious increase in respiratory rate and a loud and diffuse croup. 4, in critical cases, the patient may have difficulty in speaking, and there is a series of manifestations such as drowsiness and blurred consciousness.