I have some questions and am hoping someone can shed some light on them.. When we drain my lung every 3 days we get about the same amount, 500cc. Just prior to reaching 500cc I experience sharp grabbing pains in the lung and have to cough. If I let the drain continue the pain increases but the fluid flow does not decrease. When they were taking the fluid off with a needle they stopped when I told them I felt the grabbing pains. So, we shut the catheter off now when the pain starts? Is the grabbing pain normal ? What causes the pain ? Am I supposed to continue draining until the lung is completely drained ? What are you doing if you have this problem? Would appreciate any input.. Dutch