Unexplained Shoulder Pain May Signal Liver Cancer, Medical Experts Warn

Persistent shoulder pain, especially in the right shoulder blade area, could indicate a more serious underlying condition beyond common muscular or orthopedic issues, according to medical experts.

While shoulder discomfort typically stems from rotator cuff problems, injuries, arthritis, or nerve issues, it can sometimes be a phenomenon called “referred pain” originating from liver cancer, as noted by the American Cancer Society.

“The liver sits high in the right upper abdomen, just under the diaphragm, which is the muscle that helps us breathe,” explains Dr. Mark Ashamalla, chief of radiation oncology at Episcopal Health Services in New York. “If a liver tumor grows large enough or is positioned in a way that stretches the liver’s outer covering or irritates the diaphragm, it can trigger nerves in that area.”

This neurological connection causes the brain to misinterpret these signals, resulting in pain felt in the right shoulder or shoulder blade despite the actual problem residing in the liver. Dr. Ashamalla emphasizes this is not phantom pain, which typically refers to sensation in an amputated limb, but rather a genuine symptom caused by the body’s complex nerve pathways.

Published case reports have documented shoulder pain as a symptom of hepatocellular carcinoma (HCC), the most common type of primary liver cancer. HCC rates have been rising in recent decades, with risk factors including chronic hepatitis infections, cirrhosis, excessive alcohol consumption, and fatty liver disease.

Medical professionals note several key differences between typical orthopedic shoulder pain and liver-related referred pain. Traditional shoulder issues usually occur after injury, overuse, awkward sleeping positions, heavy lifting, or repetitive motions. This pain typically worsens with specific arm movements, and the shoulder may feel tender, stiff, or have limited mobility.

By contrast, referred pain from liver cancer often presents differently. Dr. Ashamalla identifies several potential warning signs, including:

• Pain concentrated on the right side, often near the top of the shoulder or around the right shoulder blade
• Pain not clearly triggered by arm movement
• A relatively normal shoulder examination despite persistent pain
• Deep, dull aching rather than sharp mechanical pain
• Pain that persists despite rest or routine treatments
• Accompanying symptoms like unexplained weight loss, poor appetite, nausea, fatigue, abdominal fullness or swelling, or jaundice

Liver cancer presents a diagnostic challenge because it often causes no early symptoms or only vague ones that patients might dismiss. Beyond shoulder pain, Dr. Ashamalla notes several subtle indicators including feeling full after small meals, persistent unexplained fatigue, upper abdominal discomfort, jaundice, dark urine, pale stools, itching without rash, and low-grade fevers without clear infection.

Despite these concerns, Dr. Ashamalla emphasizes that most shoulder pain is benign. “Don’t panic about ordinary shoulder pain, but don’t ignore it if it’s persistent, unexplained, or comes with other red-flag symptoms,” he advises.

Medical attention is particularly warranted if shoulder pain lasts more than a few weeks, has no clear injury trigger, doesn’t improve with standard treatment, persists even when the shoulder isn’t being used, worsens at night or during rest, continues despite a normal shoulder examination, or accompanies other potential liver cancer symptoms.

Individuals with existing liver disease or risk factors such as cirrhosis or chronic hepatitis should be especially vigilant about unexplained symptoms and consult healthcare providers promptly.

Early detection remains crucial for liver cancer outcomes, as treatment options expand and improve when the disease is caught in its earlier stages. The American Cancer Society recommends regular screening for those with known risk factors, though general population screening is not currently recommended.