Yes. A concussion can cause sensitivity to light, also called photophobia. Bright sunlight, fluorescent lights, or screens may feel uncomfortable or worsen a headache after a head injury. This symptom can appear right away or develop hours or days later. It often improves as the brain recovers, but new or worsening symptoms after a head injury need medical assessment from a healthcare professional.
What does light sensitivity after a concussion feel like?
Light sensitivity means that ordinary lighting feels brighter, more uncomfortable, or sometimes painful than usual. After a concussion, this may happen indoors under bright lights, outdoors in direct sunlight, or while using a phone or computer. Some people notice discomfort immediately, while others become more sensitive as they return to their usual activities.
According to Cleveland Clinic, sensitivity to light is a recognized physical symptom of concussion. Other symptoms may occur at the same time, although the combination differs from person to person. Examples include:
- Discomfort or pain in bright sunlight or brightly lit rooms.
- Squinting or wanting to close the eyes when exposed to bright light.
- Headaches that feel worse in bright environments.
- Blurred vision, dizziness, or difficulty concentrating on screens.
- Sensitivity to noise alongside sensitivity to light.
These experiences can occur after a concussion, but they are not a checklist for diagnosing one. Light sensitivity also occurs with other conditions, including migraine and certain eye problems, so the circumstances in which it develops are important.
Why can a concussion make light uncomfortable?
A concussion affects how the brain normally functions after an injury. Light sensitivity is one of the possible symptoms, but the symptom alone does not establish exactly why the light feels uncomfortable in an individual case. It can also be difficult to separate light sensitivity from accompanying headaches or vision difficulties without a clinical assessment.
The term photophobia is the medical name for sensitivity to light. It does not necessarily mean that someone is afraid of light. According to Cleveland Clinic's guide to photophobia, bright light can cause discomfort or pain, and the symptom can be associated with several different medical conditions, including traumatic brain injury.
How long does light sensitivity last after a concussion?
The duration depends on the person's recovery. Light sensitivity may begin immediately after the injury or appear later, sometimes after other symptoms have already started. It may gradually ease as the overall concussion symptoms improve, but there is no single recovery timeline that applies to everyone.
The Centers for Disease Control and Prevention (CDC) states that concussion symptoms may appear right away or take hours or days to develop. Most people with a mild traumatic brain injury or concussion feel better within a couple of weeks, although recovery can differ between individuals. This general timeframe does not guarantee that light sensitivity will resolve by a particular date.
Contact a healthcare professional if light sensitivity persists, worsens, interferes with everyday activities, or is not improving as expected. Ongoing symptoms may need further assessment and a recovery plan tailored to your needs.
What can help with light sensitivity during recovery?
While recovering, you can make temporary changes to your surroundings to reduce discomfort. The aim is to manage symptoms while allowing a gradual return to normal activities, rather than forcing yourself through symptoms that are getting worse.
- Adjust indoor lighting. Use softer lighting where practical and reduce glare from windows or overhead lights.
- Reduce screen brightness. Lower the brightness on phones, tablets, and computers, and take breaks if screen use brings on symptoms.
- Use suitable outdoor protection. A brimmed hat or sunglasses may help when bright daylight is uncomfortable.
- Take breaks when needed. Pause activities that increase discomfort and spend some time in a quieter, more comfortable environment.
- Return to activities gradually. Increase reading, screen use, work, schoolwork, and physical activity according to your symptoms and your healthcare professional's guidance.
The MedlinePlus guide to concussion testing explains that recovery plans commonly involve physical and mental rest, sometimes including limits on screen time. Activities can then be increased gradually as symptoms improve. A clinician can help determine the appropriate pace for you, especially if light sensitivity is interfering with daily life.
Avoid returning to contact sports or other activities that could cause another head injury until a healthcare professional has determined that it is safe. If symptoms worsen as you resume an activity, reduce the activity and discuss your symptoms with your clinician.
When should you seek medical attention?
If light sensitivity develops after a hit, blow, or jolt to the head, arrange a medical assessment promptly if you have not already been evaluated. A healthcare professional may ask how the injury happened, when symptoms began, and whether they are changing. The examination may include checks of vision, eye movements, balance, coordination, and the pupils' responses to light.
Seek emergency medical care immediately after a head injury if you or someone you are caring for develops any of the following warning signs, as described by the CDC's concussion safety guidance:
- A headache that gets worse and does not go away.
- Repeated vomiting.
- Increasing confusion, unusual behavior, or difficulty recognizing people or places.
- Seizures or convulsions.
- Weakness, numbness, reduced coordination, or slurred speech.
- One pupil becoming larger than the other.
- Loss of consciousness, increasing drowsiness, or difficulty waking up.
Do not wait for all these signs to appear. Light sensitivity by itself does not tell you whether a head injury is serious, and the absence of these warning signs does not rule out a concussion.
Can children have light sensitivity after a concussion?
Yes. Children and teenagers can experience sensitivity to light after a concussion, along with symptoms such as headaches, dizziness, fatigue, and vision problems. Younger children may be unable to explain that light hurts or feels too bright. Instead, caregivers may notice unusual irritability, more crying than usual, less interest in play, or changes in eating and sleeping.
The CDC's HEADS UP guidance on concussion signs and symptoms emphasizes that symptoms can look different depending on a child's age and may take hours or days to become noticeable. A child with possible concussion symptoms after a head injury should be assessed by a healthcare professional. Emergency warning signs require immediate care.