Most headaches after hitting your head resolve within a few days to a week. In some cases, they can linger for up to three months and still be considered a normal part of recovery. If a headache persists beyond three months, it’s classified as a chronic or persistent post-traumatic headache, which requires a different approach to treatment.
The General Timeline
A headache that starts immediately after a head impact typically begins within seconds or minutes and can last up to seven days. This is the most common pattern, and for many people the pain fades steadily over that first week without any specific treatment beyond rest and basic pain relief.
When headaches continue past that first week, they can persist for up to three months and still fall within the expected recovery window. The three-month mark is the dividing line doctors use: headaches that resolve before then are considered acute, while those lasting longer are reclassified as persistent. The headache doesn’t need to be constant during this period. It may come and go, flare with activity, and gradually become less frequent.
What the Headache Feels Like
About 75% of people with post-traumatic headaches experience symptoms that look like a migraine: throbbing pain, sensitivity to light and sound, nausea, and worsening with physical activity. The remaining cases tend to feel more like a tension headache, with a dull, pressing sensation. The only thing that distinguishes these headaches from a regular migraine or tension headache is the fact that they started after a head injury.
Among people studied with persistent post-traumatic headaches, nearly all reported moderate or severe pain intensity. About 90% had sensitivity to sound, 86% had sensitivity to light, and roughly 80% experienced nausea. Some also reported vomiting. These symptoms can be alarming, but they don’t necessarily mean something more serious is happening. They reflect how the brain’s pain-signaling system responds to trauma.
Why the Head Injury Causes Pain
When your head takes a hit, several things happen inside the brain that trigger and sustain headache pain. The impact causes a burst of inflammation, disrupts the brain’s normal energy metabolism, and activates the network of nerves responsible for head and face pain. The brain’s built-in system for dampening pain signals also becomes less effective after trauma, which is why even mild stimulation like bright lights or loud sounds can feel overwhelming during recovery.
These changes are temporary in most cases, but they explain why the headache doesn’t just stop the moment swelling goes down. The brain needs time to restore its chemical balance and recalibrate its pain-processing systems.
What Makes Some Headaches Last Longer
Interestingly, the severity of the initial injury doesn’t predict how long the headache will last. A relatively minor bump can produce headaches that drag on for months, while a harder impact might resolve within days. The factors that do matter are more about your individual history and circumstances.
People with a prior history of headaches or migraines are more likely to develop persistent symptoms. A previous brain injury also raises the risk, even if it happened years ago. Anxiety is one of the strongest predictors of prolonged recovery. Sleep problems, dizziness, and ongoing stress all contribute as well. Women are diagnosed with persistent symptoms more often than men, though this may partly reflect differences in who seeks medical care. Adults in their 20s and 30s report persistent symptoms most frequently, but older adults tend to have more prolonged and serious cases when they do develop them.
What Helps During Recovery
The first 24 to 48 hours after a head injury call for limited physical and mental exertion. After that initial rest period, light activity actually helps speed recovery. Gentle, non-contact aerobic exercise that stays below the level where symptoms flare up, like walking, is a good starting point. The key principle is to let your symptoms guide you: if activity makes the headache worse, scale back and try again after resting.
For pain relief, over-the-counter options like ibuprofen and acetaminophen are the first line of treatment. Taking ibuprofen on a scheduled basis for the first three days, combined with acetaminophen, has the strongest evidence behind it. After that initial period, these can be used as needed when headaches flare. Opioid painkillers should be avoided entirely, as they haven’t been shown to help with post-traumatic headaches and carry risks of dependency and rebound headaches.
If headaches are still significant after two weeks, supplements like magnesium (400 to 500 mg at night) and riboflavin (400 mg daily) can be tried as preventive measures, with six to eight weeks needed to see whether they help. For people with disrupted sleep, melatonin at a low dose may address both the sleep issue and the headache cycle. Physical therapy targeting the neck and vestibular system, along with cognitive behavioral therapy for managing pain and anxiety, are also effective non-drug options that can be started based on individual needs.
When a Headache Signals Something Serious
Most post-impact headaches are uncomfortable but not dangerous. However, certain symptoms after a head injury require immediate emergency care. A headache that keeps getting worse and won’t go away is the most relevant warning sign for someone monitoring their symptoms at home.
Other red flags that call for a 911 call or emergency visit include:
- Seizures or convulsions
- Repeated vomiting
- Increasing confusion, agitation, or unusual behavior
- Growing drowsiness or inability to stay awake
- Slurred speech, weakness, numbness, or loss of coordination
- One pupil noticeably larger than the other, or double vision
- Inability to recognize familiar people or places
These symptoms can indicate bleeding or swelling inside the skull, which needs immediate treatment. In young children, inconsolable crying or refusal to eat or nurse after a head impact warrants the same urgency.
Returning to Normal Activity
Recovery works as a stepwise process. You increase your activity level gradually, and only move to the next step if symptoms don’t return at the current level. If headaches or other symptoms come back during a particular activity, that’s a signal to stop, rest until symptom-free for at least 24 hours, and then retry at the previous, easier level.
This applies to both work and exercise. You may initially need to reduce your hours, take more breaks, or avoid mentally demanding tasks. For athletes, return-to-play protocols follow the same stepped approach, with each stage monitored before progressing. Driving deserves extra caution if you’re experiencing problems with attention, reaction time, or processing speed. Adequate sleep, including daytime naps or rest breaks when fatigue hits, supports faster recovery throughout this process.