Understanding Causes and Detecting Armpit Swellings
This article explores common causes, diagnostic procedures, and treatment considerations for armpit swellings. It emphasizes the importance of medical evaluation to rule out serious conditions such as infections or cancers. Understanding the symptoms and diagnostic options helps individuals seek timely medical advice for proper management and peace of mind.

Understanding Causes and Detection of Armpit Swellings
An armpit swelling refers to an enlarged lymph node located beneath your arm. These lymph nodes are essential components of your immune system, acting as small, oval glands spread throughout your body. Sometimes, the swelling may be minor and unnoticed, while at other times it can become prominent and easily felt.
The cause of the swelling might be linked to your use of deodorants or after-shaving products. It could also result from cysts or infections within your body. Medical evaluation is advised if the swelling enlarges, is painless, or persists for a long time.
Below are common reasons for armpit swellings:
Potential causes of armpit swelling: In most cases, swollen lymph nodes under the armpit are benign and due to tissue growth disturbances, often resolving without intervention. Nevertheless, some causes may indicate serious health concerns, including:
Reactions to vaccines
Signs of breast cancer
Non-cancerous fibroadenomas
Bacterial or viral infections
Blood cancer such as leukemia
Lupus affecting joints and organs
Benign fat tissue growths known as lipomas
Allergic responses
Fungal infections
Cancer of the lymphatic system, lymphoma
Assessment procedures for armpit swellings: A detailed physical exam is crucial for identifying the nature of the swelling.
Your healthcare provider may inquire about your symptoms or gently examine the area to assess its texture. If the swelling appears harmless, no further treatment might be necessary. However, if concerns arise, additional diagnostic tests may be recommended.
Diagnostic tests for armpit swelling: Depending on the initial examination, your doctor could suggest some tests to exclude serious conditions, such as:
Complete blood count (CBC)
Chest and breast X-rays
Biopsy of the affected lymph node
Allergy testing
Having an armpit swelling usually isn’t alarming, as it tends to resolve on its own. Nonetheless, consulting a healthcare professional ensures there are no underlying health issues that need attention.