Vestibular Migraine: This condition is a common cause of vertigo and can occur without nystagmus. It is often associated with migraine headaches, but can also occur without headache. The absence of nystagmus does not rule out vestibular migraine, as nystagmus may not always be present.

Benign Paroxysmal Positional Vertigo (BPPV): Although BPPV typically presents with nystagmus, it can occasionally occur without it, especially if the patient is not in the position that triggers the vertigo.
Labyrinthitis: This is an inner ear disorder that can cause vertigo, and while nystagmus is common, it may not always be present, especially in the early stages.
Vestibular Neuritis: Similar to labyrinthitis, vestibular neuritis can cause vertigo without nystagmus, particularly if the inflammation is localized and does not affect the parts of the vestibular system responsible for nystagmus.

Posterior Circulation Stroke: Although less common, a stroke in the posterior circulation can cause vertigo without nystagmus. It is crucial to consider this diagnosis due to its potential for severe consequences if missed.
Multiple Sclerosis: In rare cases, multiple sclerosis can present with vertigo as an initial symptom, and while nystagmus is more common, its absence does not rule out this diagnosis.
Acoustic Neuroma: A tumor on the vestibulocochlear nerve can cause vertigo, and while nystagmus may be present, it is not always the case, especially in early stages.

Mal de Debarquement Syndrome: A rare condition that occurs after a period of exposure to motion, such as a boat ride, and can cause a persistent feeling of vertigo without nystagmus.
Perilymph Fistula: A rare condition involving an abnormal connection between the inner and middle ear, which can cause vertigo, and while nystagmus is possible, it may not always be present.