This is Dr Basu, experienced Internal Medicine Specialist.
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Brain related issue should worsen over time not improving.
Also additional symptoms like facial weakness, arm or leg weakness, speech difficulty etc also should be experienced.
So brain problem is unlikely.
Even if it is not migraine, headaches can be different types like tension, cluster or icepick headache without any underlying cause.
However if your headache worsens again, you do need a brain scan then.
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