Razor Blade Throat? The Painful New Symptom Linked to NB.1.8.1 COVID Variant

If you’ve recently had a severe sore throat that felt sharp or “razor-like,” you’re not alone—and it could be a sign of a new COVID-19 variant: NB.1.8.1.
This subvariant of the Omicron lineage, first detected in China in January 2025, is now being tracked globally by health agencies including the World Health Organization (WHO). While classified as low-risk at the moment, experts warn that NB.1.8.1 spreads faster and may evade immune defenses more effectively than earlier strains.
What Is NB.1.8.1?
- A direct evolution of the LP.8.1 Omicron variant
- Accounts for 37% of new COVID-19 cases in the U.S. as per CDC’s Nowcast (May 25–June 7)
- Second only to LP.8.1 (38%)
- Other circulating variants: XFG (8%), XFC (7%), LF.7.9 (4%)
What Is ‘Razor Blade Throat’?
One of the distinctive and alarming symptoms reported with NB.1.8.1 is a severe sore throat—described by patients as:
- “Swallowing razor blades”
- Starts scratchy, worsens rapidly
- Makes eating, sleeping, and talking painful
Doctors are seeing this symptom more frequently compared to earlier variants.
Other Symptoms (Common & Severe)
While the CDC hasn’t released an official symptom list, patients have reported:
Common symptoms:
- Fever & chills
- Dry cough
- Fatigue
- Runny nose
- Congestion
- Headaches
- Loss of taste or smell
- Body aches
- Nausea or upset stomach
Severe symptoms (seek medical help):
- Chest pain or tightness
- Difficulty breathing
- Bluish lips or nail beds
- Confusion or disorientation
How to Protect Yourself
The CDC and WHO continue to recommend vaccination and precautions, especially for:
- Adults over 65 years old
- Pregnant individuals
- People in long-term care facilities
- Those who are immunocompromised
The 2024–2025 COVID-19 vaccine is proven effective in reducing severity and hospitalization due to NB.1.8.1.
Final Word
While NB.1.8.1 is not currently classified as high risk, its rapid spread and distinct throat pain symptom have drawn global attention. Stay informed, follow public health guidelines, and if you experience symptoms—especially “razor blade throat”—consider testing and consulting a doctor promptly.











