Which of the following are causes of lateral epicondylitis?

Lateral epicondylitis, commonly known as tennis elbow, is primarily caused by repetitive stress and overuse of the forearm muscles and tendons near the elbow joint. Overuse occurs when activities involve repetitive wrist and arm motions, leading to inflammation and microtears in the tendons attached to the lateral epicondyle of the humerus. Poor technique in sports or activities can exacerbate this condition, as improper mechanics can increase the strain on the muscles and tendons.

This explanation aligns with the correct choice regarding the primary factors contributing to lateral epicondylitis, emphasizing the connection between overuse, poor technique, and the development of the condition. Other options include factors that may influence overall health or susceptibility to injuries, but they do not directly cause lateral epicondylitis in the way that overuse and poor technique do. For example, while injury could lead to inflammation, it is not the repetitive motion and technique errors that are directly related to the typical diagnosis of this condition.