A hard blow to the head can cause a condition known as traumatic brain injury (TBI).

The U.S. National Institute of Neurological Disorders and Stroke mentions these possible symptoms of a TBI:

• Losing consciousness.
• Feeling confused, lethargic or tired.
• Developing a headache, or feeling lightheaded or dizzy.
• Having blurry vision or feeling that your eyes are tired.
• Hearing a false ringing sound in the ears.
• Having a bad taste in the mouth.
• Having changes in patterns of sleep, behavior, memory or concentration.

Source: HealthDay

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