Was looking for this thread a few weeks back. After 30 years with what I would call a medical clean slate my right lung spontaneously collapsed whilst I was digging by myself in the middle of the week at our jumps, which are very secluded. Sat around for half an hour thinking I had some bad cramps in my shoulder, then dragged myself home and felt better after 2 hours so I went back and dug for another hour. Then in the evening the ''cramp'' came back, this time combined with uncontrollable coughing. Went to the doctor the next morning who send me over for a röntgen, after which I was diagnosed with a spontaneous pneumothorax. I was hospitalized for 6 days and the CT scan revealed some blisters/bubbles on my lung, of which one most likely popped and caused this adventure so I went back in for surgery halfway December. Everything went fine and I had my first ride again this week. In retrospect I was very lucky I still managed to get home by myself (and very stupid to go back afterwards), could have taken days before somebody would've found me.