where in the armpit are lymph nodes

Daniel Parker

3 min read

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13-03-2025

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Lymph nodes are small, bean-shaped glands that are part of the body's immune system. They play a crucial role in filtering lymph fluid, a clear fluid containing waste products and infection-fighting cells. Swollen lymph nodes, often called swollen glands, can be a sign of infection or other health issues. This article focuses on the location of lymph nodes in the armpit, also known as the axillary lymph nodes.

Understanding the Axillary Lymph Nodes

The armpit, or axilla, contains a significant cluster of lymph nodes. These axillary lymph nodes are strategically positioned to filter lymph fluid draining from the:

• Breast: Lymph from the breast primarily drains into the axillary lymph nodes. This is a key reason why examining the armpits is important in breast cancer detection.
• Arm: Lymph fluid from the arm and hand also flows through these nodes.
• Upper chest and back: A portion of the lymphatic drainage from these areas also passes through the axillary lymph nodes.

The axillary lymph nodes aren't all located in one single place. Instead, they are grouped into several levels based on their anatomical location relative to the blood vessels and muscles of the armpit. These groups include:

Levels of Axillary Lymph Nodes

Precise anatomical location varies slightly among individuals. However, surgeons and medical professionals generally categorize axillary lymph nodes into these levels:

• Level I: These are the lowest nodes, located near the lower edge of the pectoralis minor muscle.
• Level II: Situated directly beneath the pectoralis minor muscle.
• Level III: Found above the pectoralis minor muscle. These are often referred to as the apical nodes.

Knowing these levels is important for staging cancer, particularly breast cancer. The spread of cancer cells to different levels of lymph nodes influences treatment strategies and prognosis.

What Causes Swollen Lymph Nodes in the Armpit?

Swollen lymph nodes in the armpit, or anywhere else in the body, are often a sign that your immune system is working hard. Common causes include:

• Infection: This is the most frequent cause. Infections in the arm, breast, or upper body can lead to swollen nodes in the armpit. Examples include skin infections, upper respiratory infections, and even minor cuts or scrapes.
• Immune System Disorders: Conditions like lupus and rheumatoid arthritis can cause lymph node enlargement.
• Cancer: While less common than infections, cancer can cause swollen lymph nodes. Breast cancer, lymphoma, and other cancers can spread to the axillary lymph nodes.
• Other Conditions: Less common causes may include certain medications, allergic reactions, and other inflammatory conditions.

When to See a Doctor

While many cases of swollen lymph nodes resolve on their own, it's crucial to consult a doctor if you experience:

• Persistent swelling: Swelling lasting for several weeks or months warrants medical attention.
• Painful swelling: Tender or painful lymph nodes may indicate an infection.
• Hard or fixed lymph nodes: Nodes that feel hard and are not easily movable might be a cause for concern and should be evaluated by a doctor.
• Fever or other symptoms: If swollen lymph nodes are accompanied by fever, night sweats, weight loss, or fatigue, seek medical attention immediately.

Finding the Lymph Nodes Yourself (for informational purposes only)

You can try to feel for your axillary lymph nodes by gently running your fingers under your armpit. However, it's important to note that:

• Not all lymph nodes are palpable: Many are too small to feel.
• Self-examination is not a substitute for professional medical evaluation. If you have concerns about your lymph nodes, consult a physician.

This information is for educational purposes only and should not be considered medical advice. Always seek the advice of a healthcare professional for any questions or concerns regarding your health. They can properly assess your symptoms and recommend appropriate diagnostic tests and treatment.