Numbness in the Left Back of the Head: Causes and Tests - Neurology

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Numbness in the left back of the head can be concerning, and it's important to understand the potential causes and necessary evaluations. Based on your description, the numbness can vary in intensity and frequency, which suggests that it may not be a constant issue but rather episodic. Here are some possible causes and considerations for your symptoms:
1. Nerve Compression or Irritation: One common cause of numbness in the head is nerve compression. This can occur due to poor posture, muscle tension, or even a herniated disc in the cervical spine that may affect the nerves that innervate the scalp. If you have a history of neck issues or muscle strain, this could be a contributing factor.

2. Cervical Radiculopathy: This condition occurs when a nerve in the neck is compressed or irritated, leading to symptoms that can radiate to the head. If you have experienced neck pain or discomfort, this could be a potential cause of your numbness.

3. Migraines or Other Headaches: Migraines can sometimes present with sensory disturbances, including numbness or tingling in specific areas of the head. If you have a history of migraines, this could be a relevant factor.

4. Tension Headaches: These are often associated with muscle tightness in the neck and scalp, which can lead to sensations of numbness or tingling. Stress and poor posture can exacerbate these headaches.

5. Multiple Sclerosis (MS): Although less common, MS can cause numbness and tingling in various parts of the body, including the head. If you experience other neurological symptoms, such as vision changes or coordination issues, this should be evaluated further.

6. Transient Ischemic Attack (TIA): A TIA, or "mini-stroke," can present with sudden numbness or weakness, typically on one side of the body. If your numbness is sudden and accompanied by other symptoms like confusion, difficulty speaking, or weakness, seek immediate medical attention.


Recommended Tests and Evaluations
If your symptoms persist or worsen, it is advisable to consult a healthcare professional, preferably a neurologist. They may recommend the following tests:
- Neurological Examination: A thorough examination to assess your reflexes, strength, sensation, and coordination.

- Imaging Studies: An MRI or CT scan of the brain and cervical spine may be ordered to rule out structural issues, such as herniated discs or lesions.

- Electromyography (EMG) and Nerve Conduction Studies: These tests can help determine if there is nerve damage or compression affecting the sensation in your head.

- Blood Tests: To check for underlying conditions such as vitamin deficiencies, thyroid issues, or autoimmune disorders that could contribute to neurological symptoms.


Conclusion
While occasional numbness in the back of the head can be benign, especially if it resolves quickly and does not interfere with daily activities, it is essential to monitor the frequency and intensity of your symptoms. Keeping a headache diary, noting when the numbness occurs, its duration, and any associated symptoms can provide valuable information to your healthcare provider. If you notice any alarming changes, such as increased frequency, severity, or the onset of new symptoms, do not hesitate to seek medical attention. Early evaluation can lead to appropriate management and peace of mind.