A concussion is caused by a bump, jolt, or blow to the head. This sudden motion causes the brain to move or twist around inside the skull, resulting in physical damage or chemical changes to brain tissue. Concussion symptoms vary. Some people may not even know they have one, while others experience more serious and notable symptoms. Most people completely recover, but this type of traumatic brain injury should be taken seriously.

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1. Headache

A headache is one of the most common symptoms of a concussion and can be caused by physical damage to the brain or chemical changes. While most headaches are treatable using over-the-counter medication, a doctor should confirm that no bleeding has occurred before the individual takes any medication — some OTC pain medications can make bleeding worse. Most headaches from concussion resolve after a few days, but chronic headaches are possible.

Headache Pressure Injury joshblake / Getty Images
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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.