What Does It Mean When Your Arms Feel Heavy and Weak?

Heavy, weak arms typically signal muscle fatigue, circulation problems, or nerve compression. Common causes include overuse from exercise, poor posture leading to nerve impingement, or prolonged positioning that reduces blood flow. Medical conditions like carpal tunnel syndrome, cervical spine issues, or peripheral neuropathy can create persistent heaviness. Vitamin deficiencies, particularly B12 or magnesium, affect muscle function and may cause weakness. Heart conditions occasionally manifest as arm heaviness, especially during exertion. Most cases resolve with rest, stretching, and improved ergonomics, but sudden onset with chest pain, numbness, or severe weakness warrants immediate medical evaluation.

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