Most concussion headaches resolve within about 10 days, but the first few days can be miserable. Relief comes from a combination of careful pain medication use, managing your environment, staying hydrated, and giving your brain the conditions it needs to heal. About one-third of people develop headaches that last several months, so knowing what works early and when to escalate matters.
Why Concussions Cause Headaches
A concussion triggers a cascade of problems inside the brain. The impact stretches nerve fibers, causing them to release a flood of excitatory chemicals. This sets off a chain reaction: ions rush in and out of cells in the wrong directions, and the brain burns through glucose trying to restore balance. Lactate builds up, causing swelling and further dysfunction. Within 24 hours, the brain’s glucose supply drops and can stay low for up to four weeks, with an average recovery of about 10 days.
Blood flow to the brain also drops immediately after a concussion. Oxygen delivery can fall by as much as 35% on the first day and may not fully recover for at least a week. This mismatch between what the brain needs and what it’s getting is a major driver of headache pain, fatigue, and mental fog. Understanding this helps explain why rest and pacing are so important: your brain is literally running on less fuel and less oxygen than normal.
There’s also a neck component that often gets overlooked. The same force that rattles the brain frequently injures the upper cervical spine. The top three vertebrae in the neck share nerve pathways with the head and face, so dysfunction there can produce headaches, dizziness, nausea, and even ear or eye pain. Many people are treated only for the brain injury while a cervicogenic (neck-origin) headache goes unaddressed.
Pain Medication: What’s Safe and What Isn’t
Acetaminophen (Tylenol) is the go-to pain reliever after a concussion. Mayo Clinic specifically advises against ibuprofen and aspirin in the early period because they can increase the risk of bleeding, which is a serious concern when the brain has just been injured. Stick with acetaminophen unless a healthcare provider tells you otherwise.
One critical rule: don’t use any over-the-counter pain reliever more than twice per week. According to the Military Health System’s concussion guidelines, exceeding this frequency with acetaminophen, ibuprofen, or combination products like Excedrin can cause medication overuse headache, a rebound cycle where the pain reliever itself starts generating headaches. If you find yourself needing medication more often than that, it’s a sign your current approach isn’t working and you need a different strategy.
Environmental Changes That Help
Your brain is hypersensitive after a concussion, and reducing the demands on it is one of the fastest ways to take the edge off a headache. For the first few days to a week, the CDC recommends dimming lights, lowering noise levels, and cutting back on screen time. If you need to go outside, sunglasses and a hat help. Earplugs or noise-canceling headphones can make crowded or loud environments tolerable.
Here’s the nuance: you shouldn’t stay in a dark, silent room indefinitely. After that initial week, start gradually reintroducing normal light and sound levels. The goal is to let your brain readjust to everyday stimulation rather than becoming dependent on a controlled environment. Think of it as slowly turning up the volume rather than flipping a switch.
Sleep, Hydration, and Nutrition
Sleep is when the brain does its heaviest repair work, and poor sleep will prolong headaches. Keep a consistent bedtime and wake-up schedule. Avoid caffeine, especially later in the day. Stay off screens and away from loud music before bed. Sleep in a dark, cool room. These aren’t generic wellness tips; they directly support the metabolic recovery happening in your brain.
Dehydration worsens headaches under any circumstances, but it’s especially problematic when the brain’s blood flow is already reduced. Drink enough water throughout the day to stay well-hydrated. You don’t need to overdo it, just keep a water bottle nearby and sip consistently.
Certain supplements may help if your headaches take on a migraine-like quality, which is common after concussion. The American Headache Society notes that magnesium oxide (400 to 500 milligrams daily), riboflavin or vitamin B2 (400 milligrams daily), and CoQ10 (300 milligrams daily) can all reduce migraine frequency. Magnesium is particularly relevant because intracellular magnesium drops immediately after a concussion and stays low for several days. Melatonin at 3 milligrams before bed can also help with both sleep quality and headache frequency. These aren’t quick fixes, but they support the brain’s recovery over weeks.
Physical Therapy for Neck-Related Headaches
If your headache feels like it starts at the base of your skull or in your neck, a cervicogenic component is likely. This type of headache is well documented after concussion but frequently missed. The upper cervical joints, muscles, and nerves share pathways with the structures that generate head and face pain, so neck dysfunction can mimic or amplify a concussion headache.
A physical therapist trained in concussion management can assess your neck and apply targeted treatments. These typically include manual mobilization of stiff cervical joints, deep neck flexor and extensor strengthening, stretching of tight muscles, and postural correction. Trigger points in the neck muscles can directly refer pain into the head, and treating them often provides noticeable relief. Research has shown that combining cervical manual therapy with vestibular rehabilitation reduces recovery time in people with persistent dizziness, neck pain, or headaches after concussion.
Vestibular and Vision Therapy
Many concussion headaches worsen with eye movement, head turning, or being in visually busy environments like grocery stores. This happens because the concussion disrupts the coordination between your visual system, your balance system, and the position sensors in your neck. When these systems send conflicting signals, the result is headache, dizziness, and nausea.
Vestibular rehabilitation uses specific eye-tracking exercises, balance challenges, and head-repositioning drills to retrain these systems to work together again. It’s often done alongside cervical therapy since the neck receptors feed directly into the vestibular and visual pathways. This combination has been shown to decrease the time it takes to return to normal activity in young adults and athletes with persistent post-concussion symptoms.
Gradual Return to Activity
Complete rest beyond the first day or two is no longer recommended. The CDC advises limiting physically and mentally demanding activities for the first one to two days, then gradually increasing what you do. Light walking, gentle daily tasks, and short periods of reading or screen use can be reintroduced as tolerated. The key is pacing: if an activity makes your headache noticeably worse, scale back and try again the next day.
Exercise itself can actually help recovery once you’re past the initial acute phase. Light aerobic activity that doesn’t spike your headache, like walking or stationary cycling at a comfortable pace, supports blood flow to the brain at a time when it’s naturally reduced. Push too hard and symptoms flare; find the right level and it accelerates healing.
When Headaches Don’t Go Away
Most post-traumatic headaches resolve within the first few weeks. But roughly one-third of people develop persistent post-traumatic headache, defined as headache lasting three months or more after the injury. If you’re still dealing with significant headaches after several weeks, this isn’t something to just push through. A headache specialist or neurologist can evaluate whether your headaches have taken on a migraine pattern, a tension-type pattern, or a cervicogenic pattern, and tailor treatment accordingly.
Some symptoms after a concussion warrant immediate emergency care. Go to the ER if you experience a headache that keeps getting worse and won’t go away, repeated vomiting, seizures, confusion or inability to recognize people or places, slurred speech, weakness or numbness, one pupil larger than the other, or increasing drowsiness where you can’t stay awake. These can signal bleeding or swelling in the brain that requires urgent treatment.