M79.621

Clinical Causes: Muscle strain or overuse during physical activity Injuries such as strains, sprains, or fractures Nerve compression or pinched nerve (e.g., cervical radiculopathy) Frozen shoulder or rotator cuff injuries Arthritis affecting shoulder joints Referred pain from heart or other internal organs Tendonitis or bursitis in the shoulder region Poor posture leading to muscular imbalances Degenerative changes in neck or shoulder joints

Key Symptoms: A dull, achy, or sharp pain localized to the upper arm Pain that worsens with movement or physical activity Feeling of weakness or numbness in the arm or hand Limited range of motion in the shoulder or arm Swelling or tenderness around the shoulder Pain that radiates from the shoulder down to the elbow or hand Difficulty performing daily tasks due to discomfort Possible tingling sensations if nerve involvement is present

Diagnosis Path: Physical examination focusing on shoulder and arm movement, strength, and sensation Medical history review including recent injuries or activities Imaging tests such as X-rays to assess bone structure Magnetic Resonance Imaging (MRI) for soft tissue evaluation Nerve conduction studies if nerve compression is suspected Blood tests if infection or inflammatory conditions are considered

Treatment Protocols: Rest and activity modification to prevent further strain Application of ice or heat to reduce pain and inflammation Over-the-counter pain relievers and anti-inflammatory medications Physical therapy to strengthen muscles and improve flexibility Stretching exercises and posture correction strategies In more severe cases, corticosteroid injections may be recommended Surgical intervention, if structural damage or nerve impingement is significant Addressing underlying conditions such as arthritis or nerve issues