Here are some off the top of my head (warning, a few are kinda cliche and most of these could either be temporary or permanent):
- They lose a little bit of their personal identity
- They lose a little bit of their humanity
- They lose sight
- They overheat
- They get really cold
- They lose some ability of their brain to control their muscles (this results in weakness and incoordination)
- They can’t move at all when using the powers
- It is physically/mentally painful for them or those around them
- The object the powers are being used on suffers burn damage
- The person has to physically bear the weight of whatever object they are lifting mentally