why one side of my head vein is paining?

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Causes of one side head pain:

According to your description, such pain may be due to:

• Migraine headache
• Sinusitis
• Stress
• Eye problem
• Ear infection
• High blood pressure...etc

Diagnosis of the cause of head pain:

You have to visit your doctor for clinical examination and investigations as:

• CBC
• Eye examination
• Sinus x-ray
• Ear examination
• Blood pressure measurement

Treatment of head pain:

It depends on the cause, and to relieve pain till the right diagnosis, you can use the following treatment:
Ibuprofen 600 mg three times daily.
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