Swollen Lymph Nodes: Common Causes and When to Worry

Red flags and urgency levels

• EmergencyCall 911 or go to an emergency department now

  Swollen nodes with difficulty breathing or swallowing.

• UrgentSeek care today

  Rapidly enlarging, very painful, or draining nodes, or nodes with high fever and feeling systemically ill.

• SoonMake an appointment within days to a couple of weeks

  Nodes that do not shrink after several weeks, keep growing, or feel hard, irregular, or fixed in place.

• SoonMake an appointment within days to a couple of weeks

  Swollen nodes with persistent fever, drenching night sweats, or unexplained weight loss.

• MonitorKeep track and mention it at your next visit

  Tender nodes during a clear cold or local infection that are slowly improving as other symptoms improve.

• Infections in the throat, teeth, skin, or ears are the most common reason nearby lymph nodes swell.
• Painful, sudden swelling often tracks with infection or injury; slow, painless, hard, irregular, or fixed nodes deserve a lower threshold for evaluation.
• Location matters: neck, underarm, and groin nodes are common; nodes above the collarbone deserve particular attention and prompt clinician review.
• Swollen glands often sit near a local infection or inflammation — a reactive or lymphadenitis pattern.
• Tenderness can ease in a few days while the size of a node may take weeks, and sometimes longer, to settle.
• Infectious mononucleosis (“mono”) commonly includes swollen neck or armpit nodes along with sore throat, fever, and marked fatigue.
• Strep throat commonly includes swollen nodes in the front of the neck with a sudden sore throat and fever; confirmation needs testing with a clinician, not nodes alone.

1. 1

   Note location, approximate size, tenderness, and whether nodes are on one side or both.

2. 2

   Track sore throat, ear pain, skin infection, fever, night sweats, or unexplained weight change.

3. 3

   Avoid repeatedly pressing or squeezing nodes; observe gently instead.

4. 4

   See a clinician if swelling lasts beyond several weeks, continues enlarging, or has no obvious nearby infection.

5. 5

   Bring a simple timeline — when it started, how size and tenderness changed, and any recent infections.

6. 6

   Seek care promptly for red, warm, or very tender overlying skin, draining nodes, or high fever with feeling systemically ill.

7. 7

   For sudden sore throat with front-of-neck nodes (with or without fever), contact a clinician about evaluation — strep is confirmed by testing, not by nodes alone.

8. 8

   For a mono-like illness, rest and fluids as advised, and avoid contact sports until a clinician clears you — the spleen may enlarge.

• “Does this look like a reactive node from infection, or do we need further testing?”
• “When would imaging or a biopsy be considered?”
• “What follow-up timeline do you recommend if it is still enlarged?”
• “Are any of my medicines or conditions relevant?”
• “Which symptoms should prompt an earlier return visit?”

• Swollen Lymph NodesMedlinePlus (National Library of Medicine)
• Lymphatic SystemMedlinePlus (National Library of Medicine)
• LymphadenitisMedlinePlus (National Library of Medicine)
• About Infectious Mononucleosis (Mono)Centers for Disease Control and Prevention
• About Strep ThroatCenters for Disease Control and Prevention
• Lymphadenopathy: Differential Diagnosis and EvaluationAmerican Academy of Family Physicians

• Persistent fatigue
• Unexplained weight changes
• Persistent or unexplained rash
• How to prepare for a doctor's appointment