Vertigo is not a disease but a symptom caused by disorders of the inner ear or brain. In most cases, such as benign paroxysmal positional vertigo (BPPV), it is mild and easily treatable. However, vertigo can become serious when it originates from the brain (central vertigo), as this may indicate conditions such as a stroke, tumor, or other neurological disorders. The worst cases occur when vertigo is accompanied by symptoms, such as severe imbalance, double vision, slurred speech, or difficulty walking, which require immediate emergency medical attention.

Low blood pressure (postural hypotension), particularly following medication or dehydration, is frequently the cause of dizziness and weakness when standing. Anemia, low blood sugar, and heart rhythm issues are further factors. You should monitor your blood pressure, blood sugar, and consult a doctor if it occurs frequently or causes fainting.

The recurrence of vertigo in your sister?s case suggests that the previous diagnosis may need to be reviewed or checked for other possible underlying causes. While recurrent BPPV is common, the CT scan has been advised to rule out brain-related causes of vertigo, such as a stroke, tumor, or other structural brain abnormalities. Other inner ear conditions, including M?ni?re?s disease and vestibular migraine, should also be considered in the evaluation. In most cases, the cause remains peripheral and benign, but imaging helps ensure that no serious neurological condition is missed.

Vertigo is most often caused by inner ear or vestibular disorders such as benign paroxysmal positional vertigo (BPPV), vestibular neuritis, or M?ni?re?s disease. It may also result from migraines, head injuries, or certain neurological conditions. Lethargy is not a direct cause of vertigo, though both can occur together due to fatigue, dehydration, or other underlying health issues.

You should first consult a neurologist or an ENT specialist to determine whether your dizziness is caused by a neurological issue or an inner ear (vestibular) problem. Recommended tests include a vestibular assessment (such as videonystagmography or electronystagmography) and a complete neurological examination. It is also important to rule out other possible underlying causes, such as dehydration, low blood pressure, heat exposure from sunlight, or side effects of your medication. Since your dizziness is triggered by sunlight, testing for vitamin D deficiency or evaluating for vestibular migraine may also be helpful.

If you still feel light-headed despite taking Vertin 24 Tablet (Betahistine) and Stemetil MD Tablet (Prochlorperazine) for vertigo, it suggests that the underlying cause may not have been correctly identified or properly treated. Continuing these medicines without improvement is not advisable. You should consult an ENT specialist or a neurologist for a detailed evaluation, which may include vestibular testing or an MRI, to find the exact cause (such as M?ni?re?s disease or a central vestibular disorder) and receive specific treatment rather than just symptom relief.