Yes. High-frequency ultrasound reliably visualizes the submandibular gland, showing size, texture, stones, ductal dilatation, cysts, inflammation and many tumours. It’s non-invasive, readily available and is first-line for suspected sialolithiasis or sialadenitis. Limitations include reduced sensitivity for deep, small, or posterior lesions and limited tissue characterization; MRI/CT or biopsy may be needed for further assessment.

Yes. Submandibular lymph nodes can be cancerous — either primary lymphoid cancers (lymphoma) or metastatic spread from nearby areas (oral cavity, salivary glands, skin). Concerning signs include a firm, hard or fixed node, size >2–3 cm, progressive enlargement, persistence beyond 2–3 weeks, or systemic symptoms like weight loss, fevers, or night sweats. Seek prompt evaluation with imaging and possible biopsy.

On ultrasound the normal adult submandibular gland measures approximately 3–4.5 cm in greatest (craniocaudal) length, about 1.5–2 cm anteroposteriorly, and roughly 1–2.5 cm transversely; volume typically 6–15 mL. Size varies with age, body habitus, and hydration. Ultrasound appearance is homogeneous; measure in two orthogonal planes for accurate assessment.

Worry and see a doctor if you have persistent or worsening submandibular swelling, pain (especially worse with eating), redness, fever, pus or foul taste/drainage, a hard fixed lump, difficulty breathing or swallowing, recurrent stones or infections, unexplained weight loss, or facial weakness. Seek urgent care for high fever, rapidly expanding neck swelling, severe pain, or any signs of airway compromise.

Ultrasound can assess lymph node features—size, shape, loss of fatty hilum, cortical thickening, roundness, and abnormal blood flow—that make malignancy more likely, but it cannot definitively diagnose cancer. Suspicious ultrasound findings usually lead to tissue sampling (fine‑needle aspiration or core biopsy) and sometimes further imaging (CT/PET) to confirm diagnosis and stage disease. It’s a useful, noninvasive screening tool but has limitations and false positives or negatives.

Submandibular lymph nodes swell mainly from infections or inflammation in nearby areas—dental infections (tooth abscess, periodontal disease), oral or pharyngeal infections (tonsillitis, pharyngitis), and viral illnesses (common cold, infectious mononucleosis). Less commonly, swelling reflects skin infections, autoimmune inflammation, or malignancies of the head, neck, salivary glands, or metastatic disease. Persistent, enlarging, or hard nodes need medical evaluation.