What Could Be the Possible Causes When Your Arm Feels Weak and Painful?

Musculoskeletal Causes

Many cases of arm weakness and pain are related to musculoskeletal problems, including:

• Tendonitis: Inflammation of the tendons in the shoulder or elbow can lead to pain and weakness. Common types include rotator cuff tendonitis and lateral epicondylitis (tennis elbow).
• Bursitis: Inflammation of the bursae (small fluid-filled sacs that cushion joints) can cause pain in the shoulder or elbow, leading to weakness in the arm.
• Muscle Strain: Overuse or injury to the muscles in the arm can result in pain and weakness. This is often seen in athletes or individuals who perform repetitive tasks.
• Nerve Compression: Conditions such as carpal tunnel syndrome or thoracic outlet syndrome can compress nerves that travel to the arm, causing pain, weakness, and numbness.

Neurological Causes

Neurological issues can also lead to arm weakness and pain:

• Cervical Radiculopathy: Compression or irritation of the nerves in the neck can cause pain that radiates down the arm, along with weakness and numbness.
• Peripheral Neuropathy: Damage to the peripheral nerves, often due to diabetes or other systemic conditions, can lead to weakness and pain in the arms.
• Stroke: A stroke can cause sudden weakness or numbness in one arm, often accompanied by other symptoms such as facial drooping or difficulty speaking. This is a medical emergency.

Other Contributing Factors

Other factors that may contribute to arm weakness and pain include:

• Infections: Infections in the arm or shoulder, such as cellulitis or osteomyelitis, can cause pain and swelling, leading to weakness.
• Systemic Conditions: Conditions such as rheumatoid arthritis or fibromyalgia can cause widespread pain and weakness in the arms.
• Mental Health Factors: Psychological factors, such as stress or anxiety, can also manifest as physical symptoms, including pain and weakness in the arms.