HEADACHE: Secondary, without Red Flag Symptoms Headache Primary Usually episodic Secondary Usually constant Acute Sinusitis Dental Abscess Glaucoma Traumatic Brain Injury Acute Mountain Sickness Chronic Drugs With Red Flag Symptoms Systemic symptoms, focal neurological signs, sudden onset, old age, progressive signs of increased intracranial pressure No Red Flag Symptoms Analgesic Induced Headache Substance Withdrawal

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