Final answer:
The patient's medial elbow pain likely indicates tendinopathy of the wrist flexors, commonly known as medial epicondylitis or golfer's elbow, caused by repetitive movement and overuse in his job.
Step-by-step explanation:
The patient's presentation of medial elbow pain that worsens with prolonged gripping and carrying suggests a diagnosis of tendinopathy of the wrist flexors, also commonly known as medial epicondylitis or golfer's elbow. Given that the pain is located on the medial side of the elbow and is exacerbated by activities involving the use of the wrist flexors, which originate from the medial epicondyle of the humerus, this diagnosis is more likely than biceps tendinopathy at either the proximal or distal insertion or lateral epicondylalgia, also known as tennis elbow, which affects the lateral side of the elbow.
Tendinitis is an inflammatory condition that can be diagnosed through clinical examination, and is commonly seen in individuals whose jobs or activities involve repetitive movements. In this patient's case, regularly carrying heavy bags could easily lead to overuse of the wrist flexors and medial elbow, resulting in tendinopathy.