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Headache following Road Traffic Accident (RTA) needs to be evaluated for intracranial injuries. Neck pain
radiating to shoulders also suggest cervical spine
Siting in a car during RTA exposes you to whiplash
injuries and such injuries are prone to both intracranial and cervical spine injuries. You need to consult your doctor for a detailed physical examination and evaluation – X-ray’s and CT scan
/ MRI scan to rule out the aforementioned possibilities.
Hope this answers your query.
Wish you good health and speedy recovery.