Last Updated September 19, 2026
Short answer
A concussion is a mild traumatic brain injury that can result from a bump, blow, or jolt to the head or from a hit to the body that causes the head and brain to move rapidly. Symptoms may appear immediately or hours or days later. A CT scan is not used to identify every mild TBI or concussion, although imaging may be used when a clinician is concerned about bleeding or another serious injury.
Concussion symptoms vary from person to person and can affect thinking, memory, balance, sleep, mood, vision, and other functions. Some symptoms appear immediately, while others may not become noticeable until hours or days after the injury. A healthcare professional should evaluate a suspected concussion. See CDC’s mild TBI information and the broader traumatic brain injury guide.
Concussion Symptoms and Diagnosis
CDC explains that a mild TBI or concussion can affect how a person thinks, learns, feels, acts, and sleeps. Healthcare providers diagnose concussion using the history, symptoms, examination, and other appropriate testing. Brain imaging is not routinely needed to identify a mild TBI or concussion, although it may be used when there is concern about bleeding or another serious injury.
Documenting Symptoms and Follow-Up Care
Because concussion symptoms are not always visible, medical records and accurate reporting of headaches, dizziness, memory or concentration problems, sleep changes, light or noise sensitivity, and other symptoms can become important. Follow the treatment and activity instructions provided by your healthcare professional. See evidence and pain and suffering.
When Symptoms Need Emergency Attention
CDC advises immediate emergency medical care after a head injury for danger signs such as a worsening headache that does not go away, repeated vomiting, seizures, increasing confusion or unusual behavior, slurred speech, weakness or numbness, unequal pupils, or being unable to wake the injured person. If a clinician later discusses a moderate or severe TBI, see the TBI guide.
How Brock & Stout can help
We can gather emergency and follow-up records, document work or school effects, review crash evidence, and handle insurance communications when a concussion is part of an injury claim. Medical diagnosis and treatment remain the responsibility of qualified healthcare professionals.
Frequently asked questions
Personal injury claims are subject to filing deadlines, and the deadline that applies can depend on the facts of the case. Different notice requirements may apply depending on who is involved. Do not use this website to calculate a filing deadline. Speak with an attorney promptly.
Yes. CDC and NINDS both say you can have a concussion without losing consciousness. Only a clinician can diagnose you.
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- Psychological Effects After an Injury — Psychological Effects After an Injury
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- Rear-End Accidents — Rear-End Accidents
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- Traumatic Brain Injury After an Accident — Traumatic Brain Injury After an Accident
A traumatic brain injury affects how the brain works and can result from a bump, blow, jolt, or penetrating injury. Symptoms and severity vary, and medical professionals are responsible for diagnosis and treatment. In a personal injury claim, medical records and evidence of changes in work, school, relationships, or daily functioning may become important.
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This page is general educational information about personal injury claims as of the date shown. It is not legal advice, does not create an attorney-client relationship, and does not guarantee a result. Facts, insurance coverage, and state law vary. Do not use this website to calculate a filing deadline. Personal Injury Knowledge Center
