First of all, the correct gesture is the slap gesture.
It's hard to cough up phlegm, so you need to pat your back. Tapping the back helps to expectorate. But the gesture of patting the back needs attention. Proper use of the gesture of patting the back helps to eliminate phlegm. Five fingers should be closed, and gently pat the back to be concave.
Second, the flapping frequency.
Pay attention to the frequency of slapping, and pat your back with the correct gesture. Slow and regular, you can't slap your back at random. Because when you want to expectorate, the whole person's physical state is focused on expectoration, and breathing may not be very smooth when expectoration. If this is the case, slapping your back with your hands at random while coughing up phlegm is not conducive to coughing up phlegm, and even causes the slapped person to be out of breath, which is a safety hazard in operation. Therefore, when coughing up phlegm, you must pat it regularly.
Third, the position and strength of the flap.
When expectoration, it should be along the bronchial direction, from bottom to top, from the outer edge of the back to the inner position, maintain uniform strength, and pat the back gently at regular intervals, which is beneficial to expectoration. When everyone around us is coughing up phlegm, we all want to help each other, so we have to pat our backs. But few people really know the method, but as long as they don't beat too hard and regularly, it won't make it more difficult for the other person to cough up phlegm.
In order to relieve the symptoms of expectoration, you can also properly open the window for ventilation, which is conducive to the recovery of your health.