The evaluation of Ludwig's angina is based on a history and physical examination.

Physical findings in someone with Ludwig's angina may include:

• Fever
• Mouth swelling:
• Swelling under the tongue and chin
• Swollen glands in the neck
• Swollen tonsils

Testing is usually necessary to evaluate Ludwig's angina.

Tests that may be used to evaluate Ludwig's angina include:

• Bacterial cultures of fluid from the swollen area
• Complete blood count
• CT scan of the neck and face
• X-rays of the neck soft tissues