Why doesn't the pressure of blowing balloons increase and the suction pressure decrease?

When you blow a balloon, the gas in the balloon becomes more, so the air pressure in the balloon increases, and the gas in the balloon makes the balloon bigger.

However, when inhaling, people spontaneously expand their chests, which leads to an increase in lung volume and a decrease in air pressure. When the outside air pressure is greater than the air pressure in the lungs, gas will enter the lungs. The principle is different.

Inhaling is the same as drinking water through a straw, and blowing balloons is the same as giving people artificial respiration.