The possible causes are: 1. A small amount of otoliths still exist in the semicircular canal, and with the change of position, these small amounts of otoliths move inside the semicircular canal, which is not enough to induce typical nystagmus, but enough to cause dizziness. 2. The otoliths are dislodged from the otolith membrane of the ellipsoidal sac. After manipulation, the dislodged otoliths return to the ellipsoidal sac from the semicircular canal and are absorbed, but after all, the structure of the otolith membrane of the ellipsoidal sac is changed and its function is damaged accordingly, causing the corresponding dizziness. 3, after the balance system is destroyed, recovery requires central compensation, which requires a process, so dizziness will continue for some time. In general, this dizziness lasts for 1 to 2 weeks, so don’t worry, it will recover slowly.