Another good tip is don't reach up and grab things in very high places. If you have to, get a chair to stand up on and get whatever you need to get.
Back in 2005 I was reaching up in my closet (good example) and just felt this huge burst in my chest. It felt like mucus was breaking up. Then I rushed to the bathroom and started coughing up 3-4 8oz cup fulls of blood. Had my Mom to call the ER. I didn't even wait for it to quit. I had an infection going on at the time as well.
It did quit once I got to the hospital. I coughed up a few of Alveoli in the sink. I couldn't get to the toilet quick enough. They look like little balls or marbles. All the blood was very clotty.
My oxygen saturation was down to 84%, my head was pounding (co2) and felt like it was going to explode. I could only breathe out maybe an inch. I couldn't walk. I was in the hospital for 5 days, went home on IV meds for 10. I was left on oxygen 24/7 and it was very hard for me to walk while in the hospital. I had to gain my strength back.
I would say there were several balls (Alveoli) in the sink. Did I save them? Stupid me DID NOT save them, I didn't know what they were. We were just panicking, because this was the first time anything like this happened to me. I was more concerned about my Mom, who's face turned white as a ghost from seeing my bathroom sink/mirror looking like a scene from Friday The 13th, with blood dripping from my mirror. My face looked like I went 5 rounds with Rocky Balboa.
So after researching online when I got back home, I told my doctor exactly what it was that I coughed up, and she didn't think it was Alveoli, but I know it was. I've seen them here online (video) It did a lot of damage to my lungs, which I still suffer from to this day.
Moral of the story: If you cough up anything, KEEP IT! I wish I did.