Which part hurts in shoulder pain caused by cancer?

Jan 11, 2022 Source: Cainiu Health

Dr. Zhu Zengkuan

Introduction

First, let’s address right shoulder pain. For many people, this may seem like a minor issue and is often overlooked. However, this is not always the case: tumors located in the upper lung can pull on the pleura, potentially causing shoulder pain—most commonly, this may be an early warning sign of lung cancer.

Cancer can cause shoulder pain, commonly manifesting as right shoulder pain, diaphragmatic pain, or bilateral shoulder pain. When such pain occurs, patients are advised to undergo a comprehensive physical examination.

Cancer is a relatively common disease with diverse clinical manifestations; symptoms vary depending on the cancer type. Shoulder pain may be associated with certain cancers—particularly lung or liver cancer—which can affect nerves innervating the shoulder region, leading to right shoulder pain, bilateral shoulder pain, diaphragmatic pain, or pain related to the diaphragm.

Which shoulder areas are typically affected by cancer-related pain?

Right Shoulder Pain

Although right shoulder pain may seem like a minor issue to many people—and is often overlooked—it may actually signal an underlying malignancy. For instance, tumors located in the upper lung may irritate or pull on the pleura, resulting in referred shoulder pain—a potential early sign of lung cancer.

Diaphragm

In cases of liver cancer, right shoulder pain may arise from tumor compression of the diaphragm or adjacent musculature and nerves beneath the lungs. Early-stage liver cancer often produces no noticeable symptoms, making detection difficult. Even when tumors exceed 10 cm in size, some patients still lack classic presenting signs.

Diaphragm (referred pain pathway)

Therefore, heightened vigilance is warranted. As hepatic tumors grow, they may compress nearby structures—including the diaphragm or muscles and nerves beneath the lungs. Since nerves innervating the right shoulder originate from this region, such compression can result in referred right shoulder pain.

Bilateral Shoulder Pain

Lung cancer may initially cause chest wall pain, which can radiate to the ipsilateral shoulder—for example, left-sided lung cancer may cause left shoulder pain. In advanced stages, widespread metastases—including bone metastases involving the shoulders—may lead to bilateral shoulder pain. The specific pattern depends on individual disease progression and metastatic distribution.

We hope the above information is helpful. Wishing you good health and happiness!

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