Deep neck infections: emergency management
- Emergency
A neck infection with swelling, trismus or trouble breathing is an emergency: protect the airway first, then image, give antibiotics and drain.
What it is
Deep neck infections spread along the spaces between the layers of cervical fascia. The source is usually dental in adults and tonsillar or lymph node infection in children. Emergency management has a fixed order: airway, then imaging, intravenous antibiotics and drainage of any abscess, then treatment of the source. This page adds the emergency approach; the disease itself is described on the deep neck infection page.
How to recognise it
- Fever, neck pain and swelling, pain on swallowing, trismus and a muffled voice.
- Recent dental pain or extraction, tonsillitis, or injection drug use.
- Diabetes and immunosuppression mean a faster, more severe course.
- Lateral neck X-ray in a child may show widened prevertebral soft tissue (retropharyngeal space).
Step-by-step management
- Assess the airway first; with stridor or floor-of-mouth swelling call anaesthesia and ENT before anything else.
- Keep the patient sitting up, give oxygen, do not sedate, and secure the airway in theatre if it is threatened.
- Take blood cultures and start empirical intravenous antibiotics covering streptococci, anaerobes and Staphylococcus aureus.
- Obtain a contrast CT of the neck (and chest if mediastinitis is suspected) once the airway is safe.
- Abscesses are drained surgically or with guided needle aspiration by ENT; cellulitis may respond to antibiotics alone.
- Treat the source (extraction or drainage of the tooth) and control glucose; reassess daily and repeat imaging if not improving.
Deep neck spaces at a glance
| Space or infection | Typical source | Clues |
|---|---|---|
| Floor of mouth (Ludwig angina) | Lower molar teeth | Bilateral firm swelling under the jaw, raised tongue, drooling |
| Parapharyngeal | Tonsils, teeth | Trismus, tonsil pushed medially, swelling at the angle of the jaw |
| Retropharyngeal | Lymph nodes in young children; trauma in adults | Neck stiffness, drooling, widened prevertebral tissue |
| Peritonsillar | Tonsillitis | One-sided pain, trismus, uvula pushed to the other side |
Red flags
- Stridor, drooling, inability to swallow saliva or to lie flat.
- Raised floor of the mouth or tongue.
- Chest pain or widened mediastinum (descending mediastinitis).
- Septic shock, altered consciousness.
- Tender swelling along the sternocleidomastoid with septic lung emboli (Lemierre syndrome).
Next step / Initial management
- Workup: full blood count, C-reactive protein, glucose, renal function, blood cultures and contrast CT of the neck once the airway is safe.
- First-line empirical antibiotics (for example ampicillin–sulbactam or clindamycin; add vancomycin when MRSA is a risk), adjusted to cultures.
- Refer to ENT and anaesthesia as an emergency, the same moment, any deep neck infection with airway signs, trismus or floor-of-mouth swelling.
- Involve dentistry or maxillofacial surgery for odontogenic sources, and thoracic surgery if mediastinitis is found.
Test yourself
Think of the answer, then tap the question to see it.
A man with a decayed lower molar has a firm, bilateral swelling under the jaw, a raised tongue and drooling. What is the first priority?
The airway. This is Ludwig angina; call anaesthesia and ENT, keep him sitting up and plan an awake airway in theatre before imaging.
A 3-year-old with fever refuses to move the neck and drools. What does the lateral neck X-ray often show if there is a retropharyngeal abscess?
Widened prevertebral soft tissue in front of the cervical spine. Contrast CT confirms and maps the abscess once the airway is safe.
Which complication links a pharyngeal infection with internal jugular vein thrombosis and septic lung emboli?
Lemierre syndrome, classically caused by Fusobacterium necrophorum.
Connections
Educational content; it does not replace a medical assessment and is not a clinical instruction. For a real case, follow current guidelines and specialist advice.
Sources: Deep Neck Infections (StatPearls) (StatPearls Publishing, NCBI Bookshelf, 2026); Ludwig Angina (StatPearls) (StatPearls Publishing, NCBI Bookshelf, 2026).
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Representative model, for educational purposes only.