Sensitivity to light and sound usually signals that your nervous system is processing sensory input more intensely than normal. The most common cause is migraine, which affects about 12% of the population, but anxiety, concussions, chronic pain conditions, and neurodivergent traits can all lower your threshold for tolerating everyday sensory input. Understanding which pattern fits your experience helps you figure out what’s actually going on.
Migraine Is the Most Common Cause
Migraine is far and away the leading reason people develop sensitivity to both light and sound at the same time. The formal diagnostic criteria for migraine actually require either nausea/vomiting or the combination of light and sound sensitivity to be present during an attack. That’s how central these symptoms are to the condition. Migraine affects roughly 17% of women and 6% of men each year.
What surprises many people is that the sensitivity often starts before the headache does. About 77% of migraine patients experience warning symptoms 24 to 48 hours before the pain begins, and light and sound sensitivity are among them. So if you notice that bright screens or loud environments bother you a day or two before a headache hits, that’s a classic prodromal migraine pattern. The headache itself is typically one-sided, pulsating, moderate to severe, and worsened by physical activity. It lasts anywhere from 4 to 72 hours.
You don’t need to have the worst headache of your life for this to be migraine. Three out of four migraine cases are the “without aura” type, meaning there’s no visual disturbance or other dramatic warning sign. Many people with migraine assume they just have “bad headaches” and never connect their sensory sensitivity to a diagnosable condition.
How Your Brain Amplifies Sensory Signals
Your brain has a built-in relay station called the thalamus that filters and routes incoming signals from your eyes, ears, and body before they reach conscious awareness. Normally, inhibitory circuits keep this relay in check, preventing minor stimuli from registering as overwhelming. When those circuits aren’t functioning properly, sensory signals get amplified rather than dampened. Research on visual pathways shows the thalamus can boost incoming signals as much as fivefold when its feedback loops are dysregulated.
This amplification mechanism helps explain why so many different conditions share the same symptom. Whether it’s migraine, anxiety, or a concussion, the common thread is disrupted sensory gating: your brain lets through more signal than it should, and stimuli that wouldn’t bother most people become uncomfortable or even painful for you.
Anxiety and the Hypervigilance Loop
Chronic anxiety physically changes how your body responds to sensory input. When you’re in a prolonged state of stress, your nervous system stays in a low-grade fight-or-flight mode. Your heart rate stays elevated, your skin conductance increases (a marker of arousal), and your amygdala, the brain’s threat-detection center, becomes hyperreactive. This means your brain is essentially scanning the environment for danger at all times, which makes you more attuned to sounds, lights, and other stimuli that you’d normally filter out.
Researchers have identified three ways anxiety and sensory sensitivity feed each other. First, the hypervigilance that comes with anxiety causes you to notice and react to sensory input you’d otherwise ignore. Second, being overwhelmed by sensory input creates unpredictability and discomfort that worsens anxiety. Third, both conditions may stem from the same root cause: atypical development of the amygdala and reduced ability of the prefrontal cortex to regulate it. In practical terms, this means treating your anxiety often improves your sensory tolerance, and vice versa.
Concussions and Head Injuries
If your light and sound sensitivity started after a blow to the head, even a mild one, post-concussion syndrome is a likely explanation. Headache, irritability, and dizziness appear first, but sensitivity to light and sound, along with cognitive fog and mood changes, often follow within days. Light sensitivity tends to be worst during the first one to three weeks after the injury.
Most people recover within three months. But for some, light sensitivity persists for six months or longer, and in a subset of patients, it becomes indefinite. If you’re several weeks out from a head injury and still squinting in normal lighting or flinching at ordinary sounds, that timeline is worth tracking and sharing with your healthcare provider.
Chronic Pain and Central Sensitization
Conditions like fibromyalgia can make your entire nervous system more reactive to all types of sensory input, not just pain. This happens through a process where the central nervous system essentially turns up its own volume knob. Impaired descending inhibitory control (your brain’s natural “turn it down” signals) combines with enhanced central gain (amplified processing) to make non-painful stimuli register as painful or distressing. Bright lights, loud sounds, strong smells, and even light touch can all become overwhelming.
Brain imaging studies in fibromyalgia patients consistently show disrupted connectivity in the networks responsible for pain modulation and sensory filtering. This is why fibromyalgia patients often report being bothered by fluorescent lights, crowded restaurants, or fabrics that feel scratchy, all at the same time. The sensitivity isn’t in your eyes or ears. It’s in how your brain is processing the signals.
Sensory Processing Differences and Neurodivergence
If you’ve been sensitive to light and sound for as long as you can remember, sensory over-responsivity may be part of how your brain is wired. This pattern is especially common in people with autism spectrum disorder and ADHD. With sensory over-responsivity, you respond too much, too soon, or for too long to sensory input that most people tolerate without issue.
Sensory processing disorder isn’t yet an officially recognized diagnosis in standard medical manuals, which means it’s frequently under-diagnosed. Occupational therapists are typically the professionals who assess and treat it, using structured observation and symptom history rather than lab tests. If your sensitivity has been lifelong and spans multiple senses (not just light and sound but also textures, smells, or temperature), this is worth exploring.
Different Types of Sound Sensitivity
Not all sound sensitivity is the same, and the differences matter for figuring out what’s behind yours. Hyperacusis is physical discomfort or pain when sounds reach a loudness level that most people tolerate fine. It’s about volume. Misophonia is an intense emotional reaction to specific sounds, often body sounds like chewing or sniffing, regardless of how loud they are. It’s about the type of sound. Phonophobia is anticipatory fear of sound, where you avoid situations because you’re anxious that a sound will cause pain or worsen another condition like tinnitus.
These distinctions help because they point to different underlying mechanisms and different management approaches. Someone with hyperacusis may benefit from gradual sound desensitization, while someone with misophonia often needs strategies rooted in emotional regulation.
Medications and Nutrient Deficiencies
Certain medications can increase sensitivity to sound by damaging the structures of your inner ear. The most commonly implicated drug classes include aminoglycoside antibiotics (often used for serious bacterial infections), platinum-based chemotherapy drugs, and loop diuretics used to treat fluid retention. Even high-dose aspirin can cause temporary ringing and sound sensitivity. If your symptoms started after beginning a new medication, that timing is a strong clue.
Magnesium deficiency has also been linked to heightened auditory sensitivity. When magnesium levels drop, calcium channels in the sensory cells of your inner ear become more permeable, leading to overstimulation of the auditory nerve. The tricky part is that standard blood tests don’t always catch a magnesium deficiency, since blood levels don’t reliably reflect what’s stored in your tissues. People who are chronically low in magnesium also show increased susceptibility to noise-induced hearing damage.
When Sensitivity Signals an Emergency
In rare cases, sudden light sensitivity alongside fever, severe headache, and a stiff neck can indicate meningitis, an infection of the membranes surrounding the brain and spinal cord. Meningococcal meningitis can become life-threatening within hours. Additional warning signs include confusion, nausea, and vomiting. This combination of symptoms, especially if it comes on quickly, warrants immediate medical attention. The key distinction is speed of onset: sensory sensitivity that develops over hours alongside a high fever and neck stiffness is a fundamentally different situation from sensitivity that builds gradually or comes and goes over weeks.