Well, in theory they can. You can have the traditional ones like:
- Poison
- Paralyze
- Sleep
- Freeze
But along side them you can have:
- Confusion
- Leech Seed
- Or a curse (From ghost Pokemon)
All these can be aflicted alongside Poison ect.
But if you mean traditional Status then it's because you could get froze then burnt and toxic which would wipe you out in 3 hits without the additional attackers damage.
Hope this helps.