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Headache with short duration, acute onset may occur due to a number of reasons, proper headache workup is needed to ascertain the cause-
- High blood pressure
is one f possibility, so get her BP checked.
- Anaemia may present with headache, due to less iron in blood less oxygenation occurs which may present with headache, Hemoglobin to be checked.
- Refractive errors in eye may present with headache, but her eye examination is NAD, so no need to be done.
- Due to Chronic sinusitis
headache may be seen as presenting feature, which is a throbbing headache
- if every thing comes normal and headache is pulsating, associated with blurred vision
, dizziness, nausea then migraine is a possibility, proper treatment is needed in this case.
- non specific tension headache
is also a possibility as due to stress or some tension, headache may be seen is apparently normal individual.
Hope I cleared your doubt.