Benign Paroxysmal Positional Vertigo (BPPV): This condition is characterized by brief, intense episodes of vertigo triggered by specific head movements, such as looking up. The symptoms are due to the movement of otolith crystals in the inner ear.

Cervicogenic Dizziness: This refers to dizziness that originates from the cervical spine. Looking up can exacerbate cervical spine issues, leading to dizziness due to the mechanical stress on the neck and its blood vessels.
Vestibular Migraine: Although not exclusively triggered by looking up, vestibular migraines can cause vertigo and dizziness. Certain head positions might exacerbate migraine symptoms.
Orthostatic Hypotension: While primarily associated with standing up, some individuals might experience dizziness when changing head positions due to inadequate blood flow to the brain.

Vertebral Artery Dissection or Stroke: Although rare, a vertebral artery dissection can cause dizziness, especially with certain head movements. It's crucial to consider this diagnosis due to its potential for severe consequences, including stroke.
Cardiac Arrhythmias: Certain arrhythmias can cause dizziness with changes in position, including looking up, due to fluctuations in cardiac output.

Superior Canal Dehiscence: A rare condition where there's an abnormal opening in the bone overlying the superior canal of the inner ear. It can cause vertigo and dizziness triggered by sound or pressure changes, including those from looking up.
Chiari Malformation: A structural defect in the cerebellum that controls balance. It can cause dizziness among other symptoms, potentially exacerbated by certain head positions.