EE WAS CHANGING A FOAM FILLED TIRE ON SHUTTLE C AR WHEN HE STRAINED HIS LOWER ABDOMEN. HE STARTED EXPERIENCING MEDICAL PROBLEMS AFTER THIS BUT DID NOT CONNECT IT TO THE STRAIN HE HAD ON 6/4. E MPLOYEE'S CONDITION WAS NOT DETERMINED WORK RELATED UNTIL 6-20-2001. EE MISSED 6/5,12,13,14,16,20 AND IS STILL LOSING TIME.