A recent medical report details the case of a man who experienced sudden, unexplained numbness and facial pain shortly after a suspected respiratory infection. This clinical report suggests that a common virus can cause long-lasting neurological problems in the face and provides evidence that doctors should consider viral history when diagnosing sudden sensory changes. This case was published in a magazine Case reports in dentistry.
Nam Nguyen, Willow Meline, and Elborz Safarzadeh contributed to this report. They are affiliated with private dental clinics in Missouri City, Richmond, and Katy, Texas.
The authors recorded this unusual clinical event because isolated facial nerve problems after viral infection are rare and often go unrecognized. Medical professionals often attribute facial pain or numbness to common dental infections, sinus problems, or physical trauma. By sharing this particular patient’s experience, the scientists aim to expand the list of potential causes that doctors consider when evaluating unexplained facial symptoms.
To understand this case, it is helpful to know some medical terms related to the nervous system. The patient experienced symptoms commonly known as neuropathy. This simply means nerve damage or malfunction. When nerves stop working properly, they can send incorrect signals to the brain.
These false signals often manifest as paresthesia, a medical term for abnormal sensations such as tingling, burning, and numbness. The patient also experienced allodynia. This term refers to situations in which a person feels pain due to a physical stimulus that does not normally cause pain, such as a light touch to the skin.
The particular nerve involved in this report is called the infraorbital nerve. This nerve serves as a branch of a larger facial nerve network known as the trigeminal nervous system. The infraorbital nerve travels through the skull and provides physical sensation to the upper lip, lower eyelid, and midface. This nerve runs very close to your teeth and sinuses, so infections in these nearby areas often cause inflammation of the nerve.
When a virus enters the body, the immune system mounts a defense. In some cases, this protective response can mistakenly cause inflammation, affecting healthy tissue such as sensitive nerve pathways.
The researchers noted that the medical literature provides evidence linking viral infections, including COVID-19, to a variety of neurological complications. Viruses can invade nerve fibers directly or cause a widespread immune system response that indirectly damages surrounding nerve tissue. The authors wrote this report to highlight how respiratory viruses can cause localized and frustrating neurological conditions on a daily basis.
The case began when a 34-year-old man visited the dentist’s office seeking relief from a persistent uncomfortable sensation on the left side of his face. He reported persistent tingling and a raw burning sensation localized to his left upper lip and cheek. The man also felt a dull, tingling pain when someone touched the skin of his midface.
These symptoms started suddenly in May 2025. The onset occurred just one week after the patient had an upper respiratory tract illness. Several members of his family became ill at the same time, leading the family to suspect that they had contracted the coronavirus. He felt stuffy and tired, but never had a fever or cough.
Because he had not undergone any laboratory tests to confirm the presence of the specific virus, doctors could only assume that he had the virus. Even though the respiratory illness subsided, the facial symptoms did not subside. Instead, months of persistent aching and pain led him to seek medical answers.
He first went to the emergency room for help. Doctors there performed a computerized tomography scan, commonly known as a CT scan, which uses X-rays to create detailed images inside the body. The scan showed mild inflammation in the maxillary sinus, the cavity behind the cheekbone. Emergency doctors gave him a steroid injection to reduce inflammation and told him to see a specialist.
An ear, nose and throat specialist then diagnosed the man with sinusitis. The specialist prescribed antibiotics and oral steroids. These drugs successfully resolved the patient’s mild sinus problems, but the numbness and pain in her face did not change at all.
The man visited another otorhinolaryngologist for a second opinion. The doctor used a small camera to look deep into the patient’s nasal passages. Doctors found no blockage, active inflammation, or signs of disease. The specialist also performed basic neurological tests, and all the results were found to be completely normal.
With sinus problems ruled out, the patient underwent a comprehensive dental evaluation. The dental team wanted to see if there was any hidden dental infection or periodontal disease compressing the infraorbital nerve. They took special three-dimensional x-rays of his mouth and jaw to look for problems hidden beneath the gum line.
Dental staff also performed tests to check the health of the nerves inside the upper teeth. They tapped each tooth to check for structural pain. They also applied extremely cold temperatures to the tooth’s surface to measure sensory responses to ensure that the tooth’s nerves inside were alive and healthy.
All dental examinations yielded normal results. Scientists concluded that the man’s teeth and jawbone were perfectly healthy and that no hidden dental infection was the cause of his facial pain.
To pinpoint the cause of the problem, the dental team performed a diagnostic nerve block. They injected a local anesthetic similar to the numbing agent used before filling the cavity directly near the infraorbital nerve. During the injection, the patient felt a brief flash of the very raw sensations he had been experiencing for months.
This short response suggested that the needle had pinpointed the exact location of the nerve stimulation. Immediately after the injection, the patient’s face became numb, and the lingering pain and abnormal sensations completely disappeared. Symptom relief lasted approximately 6 hours, fully consistent with the expected duration of the anesthetic.
The nerve block temporarily abolished the symptoms, allowing the researchers to confirm that the sensory deficit was confined to the infraorbital nerve. The team was able to rule out dental problems, physical trauma, tumors, and sinus disease as root causes. As a result, medical providers settled on a diagnosis of retroviral infraorbital neuropathy, which refers to nerve damage caused by a recent viral infection.
Rather than prescribing powerful nerve pain medications, the dental team recommended a conservative treatment approach. They advised patients to take standard over-the-counter painkillers as needed. They also recommended taking vitamin B complex supplements.
Scientific literature suggests that certain B vitamins, particularly vitamins B1, B6, and B12, tend to support nerve health and help repair damaged nerve fibers. These vitamins play a role in the production of myelin, a protective membrane that surrounds nerves and helps them transmit signals properly.
Although this vitamin strategy is often used for nerve damage associated with diabetes, the authors noted that the risks of this strategy are very low and may aid natural healing in cases following a viral infection. The patient chose not to take strong prescription medications for her nerve pain because she felt the discomfort was manageable and wanted to avoid potential side effects such as drowsiness.
Over the next few months, the patient attended regular follow-up appointments. His symptoms never worsened, and the sensory issues did not spread to his face or other parts of his body. There was no problem with muscle weakness or jaw movement.
At a health check six months later, the man reported that his symptoms had improved by about 90%. He still experienced occasional mild seizures that lasted several days but did not interfere with his normal daily life. Since his condition was stable and improving spontaneously, the clinical team decided to simply continue to monitor him.
Readers should use caution when interpreting the results of this single medical event. One major limitation of this report is the lack of laboratory confirmation of the patient’s initial disease. Without a positive test, doctors cannot definitively say that COVID-19 caused neuroinflammation.
The patient also did not have a formal evaluation by a neurologist who specializes in brain and neurological disorders. He did not undergo advanced magnetic resonance imaging of the brain or skull base. Unlike CT scans, which are better at showing bony structures, magnetic resonance imaging provides very detailed images of soft tissue and subtle neuroinflammation. Without this advanced image processing, it remains possible that other causes of nerve stimulation exist.
Case reports are inherently limited because they only describe the experiences of specific individuals. A single observation cannot prove a direct causal relationship between a particular virus and subsequent neurological disorders. Communicating a single patient’s results to the general public tends to be scientifically risky. Medical experts need to observe similar results in many different patients before making final conclusions.
Despite these limitations, individual case reports serve a very useful function in the medical community. These serve as an early warning system for unusual or emerging medical trends. When researchers publish detailed descriptions of unique symptoms, it can help other doctors recognize similar patterns in their own clinics.
Future studies should follow a larger group of patients who develop focal neurological problems after a respiratory illness. Scientists may be able to perform targeted studies using confirmed viral tests and comprehensive brain imaging to better understand how the virus interacts with the facial nerve. More extensive research may ultimately identify the precise biological mechanisms that cause neuralgia following viral infections and determine the most effective treatments.
The study, “Persistent Unilateral Neuroparesthesia After Suspected Viral Infection,” was authored by Nam Nguyen, Willow Meline, and Elborz Safarzadeh.
