ITL suggests (and it is entirely logical) that there are many other causes of Fatigue. However, the only non-spellcasting references (to either "fatigue" or "exhaustion") that I can find are:
- "Recovery from Exhaustion" [ITL 9] "running too far too fast" and "trying some great feat of strength" are both mentioned, but no details are given
- "Glossary and Definitions" [ITL 11] "exertion" is mentioned, but no details are given
- "Drain Strength" [ITL 24] being targeted by the spell, -5 ST
- "Weight Carried" [ITL 65] carrying (15xST) lbs. of weight, -1 ST every 2 minutes
- "Running" [ITL 70] running up stairs, or climbing a shaft very fast, -1 ST
- "Tunneling" [ITL 71] digging at double rate with no break, -4 ST per hour
- "Actions During Movement" [ITL 104] failing the roll to pull yourself up while suspended over a pit, -1 ST
- "Berserking" [ITL 124] coming down from a berserker rage, -2 ST
Am I missing anything? Or is that really all that is officially specified on the subject?