Swollen Lymph Nodes Under The Armpits

What Causes Lump Under Armpit?

Lump under armpit can have various causes, ranging in severity from 'very minor' to 'generally fatal'.  Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.

Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms.  In order to diagnose lump under armpit, we could:
  • Research the topic
  • Find a doctor with the time
  • Use a diagnostic computer system.
The process is the same, whichever method is used.

Step 1: List all Possible Causes

We begin by identifying the disease conditions which have "lump under armpit" as a symptom.  Here are eight of many possibilities (more below):
  • Vasectomy Side-Effects
  • Infectious Mononucleosis
  • Non-Hodgkin's Lymphoma
  • HIV/AIDS
  • Lymphatic Congestion
  • Kali Mur Need
  • Sarcoidosis
  • CLL Leukemia

Step 2: Build a Symptom Checklist

We then identify all possible symptoms and risk factors of each possible cause, and check the ones that apply:
frequent rashes
constant fatigue
red palms/fingertips
painful cervical nodes
prostatitis
slightly elevated eosinophil count
general fungal/yeast infections
past episodes of bloodshot eyes
multiple swollen inguinal nodes
swollen cervical nodes
history of non-Hodgkin's lymphoma
multiple swollen cervical nodes
... and more than 60 others

Step 3: Rule Out or Confirm each Possible Cause

A differential diagnosis of your symptoms and risk factors finds the likely cause of lump under armpit:
Cause Probability Status
Infectious Mononucleosis 94% Confirm
HIV/AIDS 25% Unlikely
Kali Mur Need 20% Unlikely
CLL Leukemia 3% Ruled out
Vasectomy Side-Effects 2% Ruled out
Sarcoidosis 0% Ruled out
Non-Hodgkin's Lymphoma 0% Ruled out
Lymphatic Congestion 0% Ruled out
* This is a simple example to illustrate the process

Arriving at a Correct Diagnosis

The Analyst™ is our online diagnosis tool that learns all about you through a straightforward process of multi-level questioning, providing diagnosis at the end.

If you indicate recent swollen/painful lymph nodes, The Analyst™ will ask further questions including this one:
UNDER ARMPITS: Do you have any swollen lymph nodes here?
Possible responses:
→ Don't know
→ No
→ Often, but not right now
→ 1-2 lymph nodes swollen
→ 3 or more nodes swollen
Based on your response to this question, which may indicate no axillary node swelling, frequent swollen axillary nodes, swollen axillary nodes or multiple swollen axillary nodes, The Analyst™ will consider possibilities such as:
Breast Cancer
A breast self-examination should always include the armpit because breast cancer can enlarge the armpit lymph nodes even when the breast itself seems perfectly normal.
Chronic Fatigue / Fibromyalgia Syndrome
The lymph nodes that are associated with CFS are small, moveable, not tender and most commonly involve the neck, axillary region or inguinal region.
Enlarged Lymph Nodes
Enlarged Lymph Nodes also suggests the following possibilities:
Non-Hodgkin's Lymphoma
The most common symptom of non-Hodgkin's lymphoma is a painless swelling of the lymph nodes in the neck, underarm, or groin.