Deep Neck Infections
Serious infections in the deep tissue spaces of the neck
Quick Facts
- Type: Serious bacterial infection
- Common sources: Teeth, tonsils, throat, salivary glands
- Key danger: Airway compromise and spread to the chest
- Seek urgent care: Trouble breathing or swallowing, high fever, neck swelling
Overview
Deep neck infections are bacterial infections that spread into the spaces between the layers of muscle and connective tissue deep in the neck. These spaces are normally filled with loose tissue, and once infection enters them it can spread quickly and form a collection of pus called an abscess.
Because the neck holds the airway, large blood vessels, and important nerves, deep neck infections can become dangerous. They may block breathing, spread downward into the chest, or affect nearby structures. These infections are considered a medical emergency and usually require hospital care with antibiotics and, often, drainage. With prompt treatment, most people recover well.
Symptoms
Symptoms develop over hours to days and tend to worsen quickly. They include:
- Neck pain and swelling, often with redness and warmth over the area.
- Fever and chills and feeling generally unwell.
- Difficulty or pain when swallowing and sometimes drooling.
- Trouble opening the mouth (trismus).
- A muffled or hoarse voice.
- Difficulty breathing or noisy breathing in severe cases.
Difficulty breathing, drooling, an inability to swallow saliva, or a rapidly swelling neck are emergency warning signs that the airway may be at risk and need immediate care.
Causes
Deep neck infections usually start from an infection in a nearby structure that then spreads into the deep tissue spaces. Common sources include:
- Dental infections: Infected teeth or gums, a frequent source in adults.
- Throat and tonsil infections: Such as a peritonsillar abscess or retropharyngeal abscess.
- Salivary gland infections: Such as salivary gland infection.
- Other sources: Ear infections, injuries, or spread from skin infections.
The infections are usually caused by a mix of bacteria normally found in the mouth and throat. A serious infection of the floor of the mouth is known as Ludwig angina.
Risk Factors
- Poor dental hygiene or untreated tooth infections
- Recent throat or tonsil infection
- Diabetes or a weakened immune system
- Injecting drug use
- Delayed treatment of a head or neck infection
Diagnosis
Because these infections can be serious, evaluation is usually done urgently. It may include:
- Physical examination: Checking the neck, mouth, throat, and especially the airway.
- CT scan with contrast: The key imaging test to show the location and size of an abscess and how far it has spread.
- Blood tests: To assess the severity of infection.
- Cultures: Of pus or blood to identify the bacteria and guide antibiotics.
The airway is assessed first, because protecting breathing takes priority over other steps.
Treatment
Deep neck infections almost always require hospital care. Treatment focuses on protecting the airway, clearing the infection, and draining any abscess.
- Airway management: Close monitoring, and in severe cases steps to secure breathing.
- Intravenous antibiotics: Started promptly and adjusted once cultures return.
- Drainage: An abscess often needs to be drained, either through a needle, a small incision, or surgery.
- Treating the source: For example, removing an infected tooth or treating the tonsils.
Patients are usually admitted to the hospital and watched closely, because the swelling can change quickly and the airway must be protected at all times. Once the infection is under control and any abscess has been drained, antibiotics may be continued for a period to fully clear the infection. With timely treatment, most people recover well, though severe or delayed infections can spread to the chest or bloodstream and become life threatening.
Prevention
- Maintain good dental hygiene and treat tooth and gum infections early
- See a clinician for severe or worsening sore throats
- Do not ignore a growing, painful neck lump or swelling
- Manage diabetes and other conditions that weaken immunity
- Seek care promptly for any head or neck infection that is not improving
When to See a Doctor
Deep neck infections are emergencies. Call emergency services or go to an emergency department immediately if you have neck swelling with any of the following:
- Difficulty breathing or noisy breathing
- Trouble swallowing your own saliva or drooling
- Inability to open the mouth fully
- High fever with a rapidly swelling, painful neck
- A muffled voice and feeling very unwell
Early treatment greatly improves the outcome, so do not wait if these signs appear.
Frequently Asked Questions
Why are deep neck infections dangerous?
The neck contains the airway, major blood vessels, and important nerves in a small space. A deep neck infection can swell and block breathing, spread into the chest, or damage nearby structures, which is why it is treated as an emergency.
What causes deep neck infections?
Most deep neck infections start from an infection in a nearby structure, such as a tooth, tonsil, throat, or salivary gland, that spreads into the deep tissue spaces. They are usually caused by bacteria normally found in the mouth and throat.
How are deep neck infections treated?
Treatment almost always requires hospital care with intravenous antibiotics and, in many cases, drainage of an abscess through a needle or surgery. Protecting the airway and treating the original source of infection are top priorities.
When should I seek emergency care for a neck infection?
Seek emergency care immediately if neck swelling comes with difficulty breathing, trouble swallowing your own saliva, drooling, inability to open the mouth, or a high fever with rapid swelling. These signal the airway may be at risk.
Can good dental care prevent deep neck infections?
Yes, good dental hygiene and early treatment of tooth and gum infections reduce the risk, since dental infections are a common source in adults. Promptly treating severe sore throats and other head and neck infections also helps.
References
- MedlinePlus, U.S. National Library of Medicine. Neck infections.
- StatPearls, National Library of Medicine. Deep Neck Infections.
- American Academy of Otolaryngology–Head and Neck Surgery.
- Centers for Disease Control and Prevention (CDC).