What Causes Arm Pain?
Prolonged overuse or improper posture of the wrist or arm during work, daily activities, or exercise—and even compression of cervical nerve roots, the radial nerve, or the ulnar nerve—can all be underlying causes of arm pain.
If you experience tingling, numbness, or weakness in your arm—or if gripping objects feels difficult and signs of compromised circulation appear (e.g., hand edema, vascular congestion, or swelling)—you should consider the possibility of coracoid impingement syndrome.

In patients with coracoid impingement syndrome, pain intensifies when wearing heavy outerwear, lifting heavy objects, or carrying items with the affected (less comfortable) hand. Carrying backpacks or single-shoulder bags may also exacerbate symptoms. Additionally, patients often report tenderness and pain extending from the occiput to the acromion—corresponding anatomically to the upper trapezius muscle. In acute cases, even moderate or mild pressure applied directly over the coracoid process typically triggers arm pain. Severe tenderness localized to the coracoid process may radiate across the pectoralis minor region and extend toward the chest wall.