What are lung diseases?

Lung diseases are problems that make it hard for your lungs to do their job, which is to help you breathe in air and give oxygen to your body.

Imagine your lungs are like a big sponge sitting in a pool. When you breathe in, water (which is like air) goes into the sponge. The sponge soaks it up, and then it sends that water (oxygen) out to help your body work. But if the sponge gets clogged or broken, it can't soak up as much water, or maybe it doesn’t work at all.

That’s what happens in lung diseases: sometimes the sponge is too full of stuff like dust or mucus, or parts of it are damaged, and that makes it hard for your body to get enough oxygen. You might feel out of breath, like you’re trying to drink from a straw through a thick soup, it just doesn’t go as smoothly.

Some lung diseases make the sponge too tight, like when you squeeze it so much it can't stretch anymore. Others make it leaky or full of holes, like a sponge that's been left in the sun and starts to fall apart. Either way, your body gets less oxygen, and that makes everything feel harder, like climbing stairs or playing tag.