Dizziness can describe two different symptoms: lightheadedness and vertigo.

Mild lightheadedness means feeling like you are going to pass out.

Vertigo means feeling like you are spinning or moving or like the world is spinning around you. The spinning sensation:

Often starts suddenly
Usually starts with head movement
Lasts from a few seconds to minutes
What to expect
People often say that the feeling of dizziness begins when they roll over in bed or tilt their head to look at something.

Along with light-headedness and vertigo, you may also have:

Nausea and vomiting
Hearing loss
Ringing in the ears (tinnitus)
Vision problems, such as a feeling that things are jumping or moving
Loss of balance, difficulty standing