A concussion can happen without a blackout
A person can remain awake, speak normally, and still experience a mild traumatic brain injury. Concussion may follow a direct hit to the head or a jolt to the body that makes the head and brain move rapidly. Loss of consciousness is not required.
The word “mild” describes the initial severity of the brain injury; it does not mean the symptoms are imaginary or unimportant. Most people improve, but a thoughtful evaluation can identify risks, guide activity, and determine whether follow-up is needed.
Physical, cognitive, emotional, and sleep symptoms
Symptoms differ from person to person and may change during recovery. A family member may notice changes before the injured person does.
- Headache, dizziness, nausea, balance difficulty, or unusual fatigue
- Sensitivity to light or noise, blurred vision, or pressure in the head
- Feeling foggy, slowed down, forgetful, or unable to concentrate
- Irritability, anxiety, sadness, or feeling more emotional than usual
- Sleeping more or less than usual, or trouble falling asleep
Emergency danger signs
Rarely, bleeding or swelling can develop after head trauma. The CDC advises immediate emergency care for certain danger signs.
- A worsening headache that does not go away
- Repeated vomiting, seizure, or convulsions
- Slurred speech, unusual behavior, increasing confusion, or agitation
- One pupil larger than the other
- New weakness, numbness, or decreased coordination
- Loss of consciousness, extreme drowsiness, or inability to wake
How a possible concussion is evaluated
There is no single symptom or scan that answers every concussion question. Evaluation begins with the mechanism of injury and a neurological examination. A clinician may assess memory, attention, speech, eye movements, balance, coordination, strength, sensation, sleep, mood, and symptom progression.
CT or MRI may be appropriate when structural injury is a concern, but routine imaging is not required for every suspected concussion. A normal structural scan does not automatically rule out concussion because diagnosis is clinical.
Recovery and statewide neurological access
CDC guidance supports a short period of rest followed by a gradual return to light activity as tolerated and directed by a clinician. Avoid another head impact during recovery and ask for written guidance about driving, work, school, exercise, and safety-sensitive tasks.
SpineLUX provides telehealth and in-clinic neurological consultations. Mobile EEG, qEEG, and brain mapping are available across Texas when clinically appropriate, and DTI/MRI may be considered within a broader diagnostic plan. No test should be used alone to promise a diagnosis or legal conclusion.
Common questions
Frequently asked questions
Can you have a concussion without losing consciousness?+
Yes. Concussion may affect headaches, dizziness, thinking, mood, balance, vision, or sleep without a loss of consciousness.
Does a normal MRI or CT rule out concussion?+
No. Concussion is generally a clinical diagnosis. Imaging may evaluate structural injury when indicated, but scans are not necessary for every concussion.