Concussion Sick Note: Recovery Time & Workplace Support

A concussion is a form of mild traumatic brain injury (mTBI) caused by a bump, blow, or jolt to the head, or by a hit to the body that causes the head and brain to move rapidly back and forth. This sudden movement can cause the brain to bounce or twist in the skull, creating chemical changes in the brain and sometimes stretching and damaging brain cells. Clinically characterized by symptoms such as headache, confusion, dizziness, nausea, and sensitivity to light and noise, it represents a significant medical challenge. For employees in the United Kingdom, navigating sickness absence while experiencing this condition requires a clear understanding of clinical guidelines, workplace safety requirements, and statutory rights. If you need professional medical evidence to secure a sick note or support your absence, you can access our private medical certificate service or submit an online consultation request directly through our secure platform.

This detailed guide serves as a comprehensive clinical and statutory manual for workers, employers, and clinicians managing concussion-related work absences. It covers the pathophysiology of the condition, safety implications, self-certification and fit note regulations, workplace modifications, and financial entitlements under the Statutory Sick Pay (SSP) framework.

The Clinical Nature of Concussions and Head Injuries

Although concussions are classified as mild brain injuries, their effects can be serious and long-lasting. Symptoms usually appear shortly after the injury, but some may not develop for hours or days. Common physical symptoms include headache, dizziness, nausea, vomiting, balance problems, and fatigue. Cognitive symptoms can include difficulty concentrating, memory problems, feeling foggy, and slowed processing speeds. Emotional symptoms, such as irritability, sadness, anxiety, and sleep disturbances, are also common. It is critical to monitor for red flags, such as worsening headaches, repeated vomiting, slurred speech, or weakness in the limbs, which require immediate emergency assessment.

The management of a concussion focuses on rest and a gradual return to normal activities. In the first 24 to 48 hours following the injury, both physical and cognitive rest are essential. This means avoiding physical exertion, as well as activities that require mental focus, such as reading, looking at screens (computers, phones, television), and studying. As symptoms begin to improve, a step-by-step return to activity can begin, guided by a healthcare professional. If symptoms return during any stage of the recovery, the person should step back to the previous level of activity for at least 24 hours.

Most people recover from a concussion within two to four weeks. However, a significant minority experience symptoms that last for months. This is known as post-concussion syndrome (PCS). PCS can be a complex and frustrating condition, requiring a multidisciplinary approach to manage symptoms like persistent headaches, dizziness, and cognitive difficulties. Understanding these clinical management steps is crucial when discussing recovery timelines with your employer.

Why Concussions Require Complete Sickness Absence

From a clinical perspective, returning to work too early after a concussion can delay recovery and worsen symptoms. Cognitive rest is just as important as physical rest. For desk-based workers, the mental demands of reading, writing, screen use, and decision-making can trigger headaches and increase fatigue. For physical roles, the risk of a second head injury, known as second-impact syndrome, is a major concern. A second concussion before the first has healed can cause rapid and severe brain swelling, which can be fatal.

Furthermore, balance issues and dizziness make working in physical environments, such as construction sites or kitchens, unsafe. The reduced concentration and slower reaction times associated with concussions also increase the risk of accidents. For these reasons, clinicians recommend complete sickness absence during the initial recovery phase, followed by a phased return to work with specific adjustments to manage the cognitive and physical load.

If you are experiencing these symptoms and need to request an absence, you can utilize our online clinical service. By completing a digital health assessment, our GMC-registered doctors can review your case and issue a valid medical certificate. To learn more about this process, please review our guidance on how to get a sick note online or start a booking.

Understanding Post-Concussion Syndrome

Post-concussion syndrome (PCS) is diagnosed when symptoms of a concussion persist for more than a few weeks. The exact cause of PCS is not fully understood, but it is thought to involve a combination of physical damage to brain tissues, chemical changes, and psychological factors. Symptoms can include persistent headaches, dizziness, fatigue, irritability, anxiety, depression, difficulty concentrating, and sleep problems.

Managing PCS in the workplace requires careful planning and ongoing communication between the employee, employer, and clinical team. Fit notes for PCS may need to cover longer periods, such as several weeks or months, to allow for rehabilitation and specialist review. The notes can recommend detailed adjustments, such as reduced hours, frequent breaks, and modified tasks, to help the employee remain in or return to work safely.

If you are struggling with long-term symptoms and require ongoing medical evidence, our digital platform can help. We can review your clinical history, including GP records and specialist reports, to issue the necessary documentation. For more information on how employers handle private medical evidence, you can read our article on whether an employer can refuse a sick note.

Sickness Absence Rules in the UK: Self-Certification and Fit Notes

If you are unable to work due to a concussion, you must follow the statutory UK absence procedures to ensure you receive your pay and protect your position. For the first seven calendar days of your sickness, you do not need to provide a medical certificate from a doctor. You are legally permitted to self-certify your illness. You can do this by informing your employer in writing of your inability to work or by completing a self-certification form (such as the HMRC SC2 form) upon your return to work. Employers cannot insist on a doctor's note for this initial seven-day period.

The seven-day self-certification rule includes all calendar days in a row, not just working days. If your concussion symptoms persist or if your treatment requires a longer recovery period beyond the seventh day, you must obtain a Statement of Fitness for Work, commonly known as a fit note, from a registered healthcare professional to cover any further days off.

It is common for employers to refuse to pay sick leave or to initiate disciplinary procedures if there is a gap in your sickness documentation. Therefore, if you anticipate that your concussion will not resolve within a week, you should request a clinical consultation around the fifth or sixth day of your absence. If you are unable to obtain a timely appointment with your NHS GP, our digital service can evaluate your history and issue a backdated fit note if appropriate, ensuring continuous coverage.

Obtaining a Fit Note for a Concussion

A fit note for a concussion can be issued by a registered medical practitioner, such as a doctor, nurse, or physiotherapist. During your clinical evaluation, the clinician will ask about the incident that caused the head injury, the symptoms you have experienced, any emergency department visits, and the nature of your daily work. They will also assess your cognitive and physical functioning.

To support your request for a fit note, it is highly beneficial to provide any medical documentation you have collected. This can include accident reports, emergency department discharge summaries, or notes from a follow-up assessment. If you choose to use our online platform, you can securely upload these documents as part of your consultation. The clinician will evaluate this information to determine if you are "not fit for work" or if you "may be fit for work" under specific conditions.

For an initial concussion, a fit note is typically issued for one to two weeks. If your symptoms do not improve, or if you develop post-concussion syndrome, the note can be extended following a clinical review. For detailed advice on requesting documentation digitally, consult our guide on how to get a sick note online to review the required steps and evidence.

Workplace Adjustments and Phased Return to Work

As you recover from a concussion, you may reach a stage where you are no longer completely incapacitated but are still not fully recovered. This is where the "may be fit for work" option on the fit note becomes valuable. The issuing clinician can recommend specific workplace adjustments to help you transition back to your role safely and comfortably. These recommendations are designed to prevent relapses and support your rehabilitation.

For individuals recovering from a concussion, the most common workplace adjustments include:A phased return to work, starting with reduced hours and gradually increasing to your normal schedule over several weeks. You can read more about this in our phased return guide.Reduced cognitive load, which may involve simpler tasks, avoiding complex decision-making, and longer deadlines.Screen breaks, allowing you to rest your eyes and brain every 20-30 minutes, particularly for roles that involve intense computer work.Ergonomic modifications, such as dimming screen brightness, using anti-glare filters, and working in a quiet, low-stimulus environment.Avoiding safety-critical tasks, such as driving, operating machinery, or working at heights, until your balance and reaction times are normal.

Employers are legally required to consider these recommendations under UK health and safety regulations and, where applicable, the Equality Act. If your employer is unable or unwilling to accommodate the recommended adjustments, the fit note defaults to "not fit for work," and you should remain on sickness absence until you are fully recovered. You can find more detail on your rights on our pricing and services page.

Sick Pay Entitlements: SSP and Company Policies

Financial security is a major concern when you are unable to work due to illness. In the UK, you may be entitled to Statutory Sick Pay (SSP) if you meet the eligibility criteria. SSP is the legal minimum amount that employers must pay to eligible employees who are off work sick. To qualify for SSP, you must be classified as an employee, have been ill for at least four days in a row (including non-working days), and earn an average of at least the Lower Earnings Limit per week.

SSP is not paid for the first three days of your sickness absence, which are known as "waiting days." Payment begins on the fourth day of your absence. This waiting days rule is a key part of the statutory framework, and you can read a detailed explanation of it in our guide on Statutory Sick Pay waiting days. SSP is paid by your employer in the same way as your normal wages, and tax and National Insurance will be deducted.

Many employers offer contractual sick pay schemes, often referred to as company sick pay, which provide pay above the statutory minimum. These schemes vary widely, with some companies offering full pay for a set number of weeks or months. You should check your contract of employment or consult your HR department to understand your company's specific sick pay policy. If you do not qualify for SSP or if your company sick pay runs out, you may be eligible to apply for government benefits, such as Employment and Support Allowance (ESA) or Universal Credit, using your fit notes as medical evidence.

How DoctorCert Can Help

At DoctorCert UK, we understand that obtaining a sick note when you are suffering from a concussion can be incredibly difficult. The physical and cognitive strain of travelling to a GP surgery or waiting on the phone for an appointment can exacerbate your symptoms, especially with sensitivity to light and sound. Our digital consultation platform is designed to provide a safe, convenient, and professional alternative.

By submitting an online consultation, you can share your symptoms, medical history, and any supporting documentation with our team of GMC-registered doctors. We evaluate each case individually, ensuring clinical safety and validity. If approved, we will issue a digital medical certificate that meets all UK legal and employer requirements, allowing you to focus on your recovery. Visit our homepage to start your booking or review our range of clinical services.

Frequently Asked Questions

Can you get a sick note for a concussion?

Yes, you can obtain a sick note for a concussion. Because the condition is a mild traumatic brain injury that requires physical and cognitive rest, it is a recognized medical reason for sickness absence. A clinician can issue a fit note if your symptoms prevent you from performing your job safely.

How long are you signed off work with a concussion?

The duration of a sick note for a concussion depends on the severity of your symptoms and the demands of your job. For an initial period, one to two weeks is common. If symptoms persist or if you have a safety-critical job, the note can be extended.

What is a phased return to work for a concussion?

A phased return to work is a gradual transition back to your normal duties, starting with reduced hours or light tasks and increasing them over several weeks as your symptoms improve. This helps to prevent relapses and supports your recovery.

Can you look at screens with a concussion?

In the first 24 to 48 hours following a concussion, screen use should be avoided as it can trigger or worsen symptoms like headaches and fatigue. As you recover, you can gradually reintroduce screen time, taking regular breaks.

What if my concussion symptoms do not improve?

If your concussion symptoms do not improve after a few weeks, you may be experiencing post-concussion syndrome. You should consult a healthcare professional for a detailed evaluation, who may recommend specialist referral or extended fit notes.