Why Hitting the Back of Your Head Can Cause Dizziness Without Pain

A bump on the back of the head may not be painful but can cause dizziness?

On the evening of November 1st, I accidentally hit the back of my head against the wooden board of the bunk bed while getting up.
For the first three days, there was no pain, and even when I touched or pressed on it, it didn't hurt.
Although I experienced mild dizziness, it was infrequent.
However, by November 6th, while there was still no pain, the frequency of dizziness increased, and at times, my hand would suddenly feel weak or numb.
Should I get checked?

Dinopoke, 10~19 year old female. Ask Date: 2023/11/11

Dr. Peng Shiwei reply Neurology

Hello, if your symptoms persist, it is recommended to visit a hospital for an examination.
Thank you for your inquiry.

Reply Date: 2023/11/11

More Info

Hitting the back of your head can lead to various symptoms, including dizziness, even in the absence of pain. This phenomenon can be attributed to several factors related to the anatomy of the head and the brain, as well as the body's response to trauma.

When you hit your head, even if it doesn't result in immediate pain, there can still be underlying effects on the brain and surrounding structures. The brain is protected by the skull, but a sudden impact can cause a jarring motion that may affect the brain's normal functioning. This can lead to symptoms like dizziness, which may occur due to several reasons:
1. Vestibular System Disruption: The vestibular system, located in the inner ear, is responsible for maintaining balance and spatial orientation. An impact to the head can disrupt this system, leading to dizziness or a sensation of spinning (vertigo). Even if there is no pain, the vestibular system can be affected, causing you to feel off-balance or dizzy.

2. Concussion Symptoms: Although you may not have experienced pain, a concussion can occur without immediate symptoms. Dizziness is a common symptom of a concussion, which can manifest days after the injury. Other symptoms may include confusion, difficulty concentrating, and changes in mood or sleep patterns.

3. Cervical Spine Issues: The neck is closely connected to head movement and balance. An impact to the back of the head can also affect the cervical spine, leading to muscle strain or tension that can cause dizziness. If the cervical vertebrae are misaligned or if there is muscle tension, it can affect blood flow and nerve function, leading to sensations of dizziness or weakness in the arms.

4. Neurological Response: The brain and nervous system can react to trauma in various ways. Sometimes, the body may experience a temporary disruption in normal neurological function, leading to symptoms like dizziness, tingling, or weakness. This can occur even if there is no visible injury or pain.

Given your symptoms of increasing dizziness and occasional weakness or numbness in your hands, it is advisable to seek medical evaluation. While the absence of pain is a positive sign, the presence of dizziness and neurological symptoms warrants further investigation. A healthcare professional may recommend imaging studies, such as a CT scan or MRI, to rule out any serious underlying issues, such as a concussion, cervical spine injury, or other neurological conditions.

In summary, while hitting the back of your head may not cause immediate pain, it can still lead to dizziness and other symptoms due to disruptions in the vestibular system, potential concussive effects, cervical spine issues, or neurological responses. It is important to monitor your symptoms closely and consult a healthcare provider for a thorough evaluation to ensure your safety and well-being. Early intervention can help prevent potential complications and facilitate a better recovery.

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