What causes pain under the armpit?

Pain beneath the armpit (axillary region) is a relatively common symptom. There are numerous potential causes for such pain, and effective treatment begins with identifying the underlying cause, followed by timely, targeted intervention. Regular physical activity promotes metabolism and improves systemic blood circulation, thereby enhancing the body’s immune resistance. So, what causes pain beneath the armpit? Let’s explore this further.

What Causes Pain Beneath the Armpit?

1. Cold Exposure or Overuse Injury

Prolonged exposure to cold temperatures can likewise trigger axillary pain. Clinically, axillary pain is frequently attributable to cold-induced impairment of local circulation. Individuals experiencing such symptoms should prioritize basic thermal protection in daily life. Additionally, excessive physical strain may contribute to this discomfort. As traditional Chinese medicine states, “Where there is pain, there is obstruction; where there is free flow, there is no pain.” Thus, stagnation of Qi and blood stasis constitutes another primary pathogenic mechanism underlying axillary pain.

2. Mammary Gland Hyperplasia (Benign Breast Hyperplasia)

This condition predominantly affects women, who have a significantly higher incidence of mammary gland hyperplasia than men. When axillary pain arises from mammary hyperplasia, it typically manifests as either distending pain or stabbing pain—and may extend to involve one or both breasts. In severe cases, the affected area becomes highly tender to touch and may significantly impair daily functioning and work performance.

3. Neuritis

Neuritis is a frequent cause of axillary pain. Extensive clinical research indicates that many patients diagnosed with neuritis report a history of recent immunization or cold exposure prior to symptom onset. Young adults are particularly susceptible. Early-stage symptoms often begin unilaterally—localized to the root of the neck, supraclavicular fossa, or shoulder—and characteristically present as burning or sharp, lancinating pain occurring intermittently.

The above outlines the major causes of axillary pain. We hope this information proves helpful.