Return to work after a concussion.

Should you go back to work after a concussion, or wait until symptoms are gone?

Go back sooner than your instinct says, in a modified form. Care after a mild traumatic brain injury includes a short period of cognitive rest, but current guidance is clear that you should avoid medically unnecessary delay and change the work instead.

That advice comes from outcomes. The International Collaboration on Mild Traumatic Brain Injury Prognosis found most workers return within three to six months, and the studies it reviewed tie staying at work to better health, well-being, social connection, and quality of life, with fewer medical visits. People who cannot go back report more physical complaints and more anxiety, depression, and isolation. Work also gives the day a structure, which seems to help.

What does 'sub-symptom threshold' mean?

Every person recovering from a concussion has a level of physical and mental effort above which symptoms climb. The headache sharpens, the fog thickens, dizziness comes back. That level is the symptom threshold, and the whole return-to-work framework is built on staying just under it.

To find it, rate your symptoms from 0 to 10 before an activity and again after. The 2022 international concussion consensus treats a rise of up to 2 points that settles within an hour as acceptable, and expected. A rise of 3 points or more means you went past your threshold.

If you keep going over it, the plan slows down or changes shape. It does not get thrown out. Anyone who has done graded exposure for chronic pain will recognize the idea. A nervous system that has learned to overreact to activity can learn to settle again if it gets activity in doses it can handle.

How do clinicians decide what work you can do?

Your clinician compares what you can do now with what your job asks of you, and plans the steps back using three things:

• Risk: your medical status, and which activities you can do without causing symptoms to progress
• Capacity: current limits in cognitive, physical, and emotional function
• Tolerance: your symptom threshold, and the specific triggers that push you over it

The job gets mapped the same way. There is the physical demand (how hard and how long you work), the cognitive demand (how much thinking the job takes), and the work environment (noise, visual clutter, people). Concussion work accommodations goes into matching restrictions to each.

What are the three stages of return to work after a concussion?

The table sums up the stages taught to rehabilitation clinicians, based on the Ontario Neurotrauma Foundation guideline. Your plan will be adjusted to you, but most follow this shape.

Stage 1: what does the rest phase actually involve?

'Rest' here means taking it easy, not lying in a dark room. You keep up light cardio that does not push your heart rate or symptoms up much, like an easy walk or a stationary bike. Mental work stays light too, with limited screens and nothing that needs long concentration. You avoid busy places, and if you are dizzy, you probably should not drive.

In therapy, stage 1 usually covers light cardio, body mechanics, and posture. Aerobic work starts around 30–40% of maximum heart rate and builds toward 40–60% by the end of the stage. For a rough maximum, take 220 minus your age, then multiply by the target percentage.

You are ready for stage 2 when you can sustain concentration for about 30 minutes before a significant increase in symptoms, and when cognitive rest breaks reliably bring symptoms back down.

Stage 2: what do restricted work activities look like?

Most of a return-to-work plan happens in stage 2. You do more physically, on shorter or adjusted days, and skip the tasks that make symptoms worse. Work that needs concentration comes back, with priorities set for you and extra time allowed, and you get scheduled 20 to 30 minute breaks somewhere quiet.

In rehab, this stage uses work simulation, such as lifting, carrying, climbing, and holding postures, with the load going up step by step, plus more activity at home. Aerobic targets move to 60–80% of maximum heart rate. The therapist reports specific numbers (how much weight, to what height, how long in one position) so the work restrictions can keep pace.

You are ready for stage 3 when symptoms are improving, you tolerate four to five hours of activity with rest cycles, and only one or two rest breaks need to be built into the workday.

Stage 3: when is it safe to return to full duty?

Stage 3 is your normal job. That means the full expectations of the role, the hard thinking tasks, and every setting the work takes you into, with its noise, distractions, and people. Any symptoms left are manageable, and aerobic work goes from 80% of maximum up to full effort.

The work now is dropping the last modifications and building habits that keep the return stable. You are discharged when you can do everything the job needs without bringing symptoms on and there are no limits left on your activity tolerance.

What does a return-to-work progression look like in practice?

Consider a delivery driver who slips on ice, strikes the back of her head, and is diagnosed with a concussion. Three days later she has dizziness, light sensitivity, mild nausea, neck pain, and headache. Her normal workday involves around 15,000 steps and lifting packages over 50 pounds.

1. Week one restrictions: no more than 10 pounds floor to waist, no overhead lifting, no driving because of the dizziness, and a break every 20–30 minutes or as needed. Her employer moves her off the warehouse floor to sort and file in a quieter room.
2. In therapy: she manages 30–40 minutes of exercise before symptoms rise. Work simulation starts with simple floor-to-waist lifts and carries along a clear path, light weights first, with her heart rate and symptoms checked as she goes.
3. A few weeks in: she lifts 25 pounds in the clinic with symptoms at 3/10, and handles a busy therapy gym for about an hour. The therapist tells her doctor the work limit can go up to 25 pounds. She still needs breaks now and then to keep symptoms in check.
4. After that: harder tasks and interval training come in, her restrictions are updated at each step, and driving is looked at again once the dizziness is gone and she has been cleared.

What predicts a good return to work after mTBI?

Research has found factors linked to getting back to work well. They describe groups and cannot predict how any one person will do, but they help set expectations and flag who may need more support.

• Low symptom levels in the first one to two days after injury
• More than 11 years of formal education
• A job with greater independence and decision-making latitude
• No nausea or vomiting at presentation
• No extracranial injuries
• No severe pain early after the injury

The job itself matters. In the 2014 international review, people with more say over how they do their work (managers, professionals, teachers) returned more reliably than people in roles with less control, such as clerical, sales, service, and manual jobs. The same review linked slower returns to less than 11 years of schooling, nausea or vomiting on admission, other injuries alongside the concussion, and severe pain early on. Depression and a history of mental health problems are linked to slower recovery too.

Several of those, like early severe pain, a neck injury, and low mood, also predict lasting pain after other kinds of injury. When headache or neck pain outlasts the concussion, it often needs treating as a pain problem in its own right. Central sensitization and kinesiophobia explain how fear of symptoms and avoiding activity can keep the system stuck.

Who needs to be involved in a return-to-work plan?

Plans stall when the people writing the restrictions and the people applying them do not talk. That usually means the employer, the safety manager, and, for workers' compensation, the nurse case manager or claims adjuster. At each stage the clinical team shares:

• Current medical status: restrictions, limitations, and known symptom triggers
• Current job demands and work status, so restrictions line up with actual job tasks and accommodation opportunities get spotted
• Need for referrals to therapy, diagnostics, or a specialist
• A communication cadence, meaning regular updates so the employer can bring the worker back as early as the recommendations allow

When an adjuster asks when the person will be back, a date would be a guess. What the clinician can honestly give is where the person started, how far their tolerance has come, and why concussion recovery varies so much from person to person.