Given the amount of exercise I do, I would say that I'm reasonably fit and fundamentally know when something "isn't quite right" - the non-disappearance of what I thought were muscular pains after a strenuous gym session prompted the sessions to the doctor but looking back on this all:
- Deep "muscular" pain (it was actually pain in the bones because of the blast cells)
- Nose bleeds that didn't stop quickly (because platelet count is affected by the blast cells)
- Weight loss that people were commenting on (and I thought it was because of more activity and better diet :-( )
- General tiredness/fatigue (haemoglobin levels dropping meaning less oxygen being carried around)
Bottom line - don't be a hypochondriac but do listen to your body, if multple things start occurring get a proper check out to include a Full Blood Count.