7 Common Symptoms of a Concussion You Shouldn’t Ignore

Have you recently hit your head and aren’t sure whether it’s something to worry about? Concussion symptoms can show up slowly — sometimes hours after the injury — which is why recognizing early signs of a concussion matters. In Canada, concussions are more common than many people think. One in four Canadians (24%) who reported a concussion in 2022 were injured during physical sports like hockey, football, skiing, or ringette. These everyday scenarios highlight just how easy it is for a concussion to happen.

And while the symptoms of a mild concussion can be subtle — headaches, dizziness, blurred vision, or memory trouble — they’re important to take seriously. If something feels “off” after a fall, hit, or jolt, listening to your body is essential.

1)Headache — One of the Most Common Concussion Symptoms

A headache after hitting your head is often one of the earliest and most common concussion symptoms.

The pain can feel different from what you normally experience. It might be a dull ache that won’t go away or a sharp, throbbing pain that gets worse with movement.

You may notice the headache gets stronger when you bend over, cough, or try to concentrate on something. Light and noise can make it feel much worse, too.

Some people describe it as pressure inside their head. Others say it feels like pressure around their forehead or the back of their head.

If your headache is severe, comes with vomiting, or makes it hard to stay awake, you need medical care right away. These could be signs of a more serious brain injury.

2) Confusion or Feeling Dazed — A Key Concussion Warning Sign

You might feel like you’re in a fog after hitting your head. This confusion happens because your brain isn’t working at full speed. Many people describe feeling “out of it” or disconnected from what’s happening around them. You may have trouble following conversations or understanding simple questions.

This dazed feeling can last from a few minutes to several hours. Your thoughts might feel slow, and even simple decisions can feel overwhelming. Some people say it feels like they’re watching everything happen from outside their body.

This symptom often appears right after the injury but can also show up hours later. If you’re having trouble thinking clearly or notice ongoing confusion after a head injury, don’t ignore it. These signs tell you that your brain needs time to heal and recover properly.

3) Memory Loss Around the Event — A Common Symptom of Mild Concussion

Memory problems are one of the most telling signs of a concussion. You might not remember what happened right before, during, or after your injury. This type of memory loss comes in two forms: retrograde amnesia (forgetting events before the injury) and anterograde amnesia (difficulty forming new memories afterward).

You may find yourself asking the same questions repeatedly, or others might notice you repeating information without realizing it. The memory gap may last minutes or, in some cases, hours around the event.

It’s common not to remember every detail of the injury. These issues usually improve with time and rest. However, if memory problems worsen or last more than a few days, you should seek medical care right away.

4) Dizziness or Balance Problems — When Your Brain’s Balance System Is Affected

You might feel unsteady on your feet after a head injury because a concussion can disrupt the brain’s balance signals. Dizziness may feel like the room is spinning, or you may feel lightheaded or faint. Balance problems often show up when you walk or stand, causing you to sway or reach for support.

These symptoms can make simple tasks difficult. Walking upstairs, getting out of bed, or even standing still may feel challenging. Dizziness often worsens with quick head movements, like turning or looking over your shoulder.

Feeling “off” for days isn’t something to ignore. If you’re frequently dizzy or having trouble walking straight, seek medical attention—these symptoms can affect your safety.

5) Nausea or Vomiting — A Concussion Symptom That Needs Attention

Your stomach might feel upset after a head injury because a concussion affects the parts of your brain involved in digestion. Nausea can start right away or appear hours later, and you might feel sick without actually vomiting. Vomiting is more serious—one episode should be monitored, but repeated vomiting requires immediate medical attention.

Symptoms often worsen with quick head movements or when you try to eat or drink. Nausea can last for several days, and persistent upset is a sign your brain is still healing. If you can’t keep food or water down, seek medical care right away since dehydration can slow recovery.

Young children may not be able to explain nausea, so watch for loss of appetite or refusal of their usual foods.

6) Sensitivity to Light or Noise — A Common Sensory Concussion Symptom

Bright lights may suddenly feel painful after a concussion. You might find yourself squinting in normal lighting or even wearing sunglasses indoors. Loud sounds can also feel overwhelming, making regular conversations or background noise seem unusually intense.

This sensitivity occurs because your injured brain struggles to process sensory information. Fluorescent lights, traffic noise, or even screens can trigger discomfort or worsen headaches. Symptoms may appear right away or develop over the first few days, and many people find watching TV or using a phone difficult.

If bright lights make you feel sick or dizzy, or if sounds cause pain or nausea, take it seriously. These symptoms usually improve as your brain heals. Spending time in a quiet, dimly lit space can help you stay comfortable during recovery.

7) Fatigue or Drowsiness — One of the Most Overlooked Signs of a Concussion

Feeling unusually tired after a head injury is one of the most common concussion symptoms. Your brain works harder to function normally after trauma, which drains your energy. This isn’t ordinary tiredness. Concussion-related fatigue feels overwhelming and often doesn’t improve with rest.

You might find yourself falling asleep during activities you normally enjoy, and simple tasks like reading or watching TV can feel exhausting. Mental activities are often more tiring than physical ones because your brain needs extra effort to process information and concentrate.

This extreme tiredness can last for days and may come and go unpredictably. Don’t ignore persistent fatigue after a head injury—your body is signaling it needs time to heal. If you’re sleeping more than usual or feeling drowsy throughout the day, contact a healthcare provider. Rest is crucial, but medical guidance ensures you’re recovering safely.

How Concussion Symptoms Develop and Evolve

Concussion symptoms don’t always show up right away, and they can change over time. Some symptoms appear hours or even days after the injury, while others may get worse before they get better.

Recognizing Delayed Symptoms

You might feel fine right after hitting your head. This is normal! Many concussion symptoms take time to appear.

Common delayed symptoms include:

• Memory problems that show up 24-48 hours later
• Sleep issues that develop over several days
• Mood changes like irritability or sadness
• Difficulty concentrating at work or school

Some people don’t notice symptoms until they try to do normal activities. You might feel dizzy when you stand up or get headaches when you read.

Watch for these warning signs in the first week:

• Headaches that get worse instead of better
• Vomiting more than once
• Confusion that doesn’t go away
• Problems staying awake

If symptoms appear days after your injury, don’t ignore them. Your brain is still healing, and new symptoms are a sign you need medical attention.

When to Take Action for Your Concussion Symptoms

Concussion symptoms can be subtle at first, but they’re your brain’s way of telling you something isn’t right. Whether you’re dealing with headaches, dizziness, fatigue, memory issues, or delayed symptoms that appear days later, getting proper care early makes a major difference in your recovery. You don’t have to wait for symptoms to worsen before seeking help.

If you’re experiencing any of the concussion symptoms described above — or if something just feels “off” after a head injury — trust your instincts.

If you or someone you know is experiencing signs of a concussion, don’t wait. Early intervention can make all the difference in recovery. At Lake Country Physiotherapy, our team is here to assess your symptoms and guide you toward a safe, effective treatment plan. Book your appointment today and take the first step toward healing.