Here are some common effects of concussion:

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Physical Symptoms: Concussions can cause a variety of physical symptoms, including headache, dizziness, nausea, vomiting, blurred vision, sensitivity to light and noise, balance problems, fatigue, and sleep disturbances.

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Cognitive Effects: Cognitive symptoms may include difficulty concentrating, memory problems, slowed thinking, confusion, and feeling mentally foggy or groggy.

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Emotional and Behavioral Changes: Concussions can lead to emotional and behavioral changes, including irritability, mood swings, anxiety, depression, and heightened emotional sensitivity. 

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Post-Concussion Syndrome (PCS): Some individuals experience persistent symptoms beyond the typical recovery period, a condition known as post-concussion syndrome. 

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Sleep Disturbances: Concussions can disrupt normal sleep patterns, leading to difficulty falling asleep, staying asleep, or experiencing restorative sleep. 

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Sensory and Perceptual Changes: Some individuals may experience changes in their sensory or perceptual abilities following a concussion. 

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Risk of Second Impact Syndrome: After sustaining a concussion, individuals may be more susceptible to subsequent concussions, especially if the brain has not fully healed. Second impact syndrome, which occurs when a second concussion happens before the first has resolved, can result in severe brain injury or even death.

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It's important to note that the effects of a concussion can vary from person to person, and some individuals may recover more quickly or experience milder symptoms than others. However, anyone suspected of having a concussion should seek medical attention promptly to ensure proper evaluation, management, and monitoring of symptoms. Returning to normal activities too soon or without proper medical clearance can increase the risk of complications and prolong recovery.