What Causes Pain Under a Man’s Armpit?

In daily life, many people experience axillary (underarm) pain for various reasons. Because the axilla contains numerous vital lymphatic tissues and blood vessels—and is closely linked to both physical and psychological health—axillary pain should never be overlooked. Lymph node enlargement, for instance, may be associated with numerous complex factors. So, what causes axillary pain in men? Below, we address this question.

Causes of Axillary Pain in Men

1. Qi Stagnation and Blood Stasis

As the traditional saying goes, “Pain arises from obstruction; when flow is unimpeded, pain ceases.” Qi stagnation and blood stasis constitute another primary cause of axillary pain. Prolonged exposure to cold, excessive physical strain, or overexertion can all contribute to qi stagnation and blood stasis, resulting in impaired circulation of qi and blood—and consequently, pain.

2. Gynecomastia (Male Breast Hyperplasia)

Just as in women, men can also develop gynecomastia—a benign enlargement of breast tissue. The underlying causes are similar to those in women, primarily involving liver dysfunction or medication-induced endocrine imbalances, which disrupt hormonal equilibrium in the bloodstream and trigger breast tissue proliferation. However, gynecomastia occurs far more frequently in women than in men.

3. Neuritis

Neuritis most commonly affects younger individuals. In its early stages, pain typically manifests on one side—in the root of the neck, supraclavicular fossa, or shoulder—and is often described as burning or stabbing in character, occurring intermittently. As the condition progresses, pain intensifies; notably, axillary discomfort becomes markedly worse during abduction or elevation of the upper limb.

4. Psychological Stress

In many cases, axillary pain is closely linked to psychological factors. Chronic mental stress can lead to sustained neuromuscular tension, thereby triggering pain. Additional common contributors include prolonged poor posture, localized inflammation, and ischemic cardiac disease.

The above outlines the principal causes of axillary pain in men. We hope this information proves helpful.