Pain in the joint at the bend of the right arm, unable to straighten it.

The right arm usually refers to the right upper limb. Pain in the joint at the bend of the right arm, accompanied by an inability to fully extend it, may be related to factors such as trauma, lateral humeral epicondylitis, osteoarthritis, tennis elbow, or myositis ossificans. Treatment should be based on the specific underlying cause. Detailed analysis is as follows:

1. Trauma

If the right arm suffers a strong impact or if one falls accidentally, causing skin damage at the elbow area, the patient may experience difficulty straightening the arm due to pain. Generally, symptoms improve once the wound has healed and formed a scab.

2. Lateral Humeral Epicondylitis

This condition commonly affects individuals who perform intensive forearm activities and is also known as "tennis elbow." Patients typically experience pain on the outer side of the elbow joint, along with tenderness over the lateral humeral epicondyle. In mild cases, non-steroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen tablets or diclofenac sodium sustained-release tablets, may be taken under medical guidance to relieve pain.

3. Osteoarthritis

The articular cartilage in the right elbow joint may undergo degenerative changes with aging, leading to elbow pain and restricted movement, including an inability to fully extend the arm. In such cases, medications like meloxicam tablets or celecoxib capsules may be used as directed by a physician to alleviate symptoms.

4. Tennis Elbow

If a patient repeatedly overuses the wrist over a long period, chronic injury may develop at the lateral humeral epicondyle, resulting in tennis elbow and the aforementioned symptoms. Under medical supervision, patients may take medications such as prednisone acetate tablets or acetaminophen tablets for relief.

5. Myositis Ossificans

Following trauma to the elbow joint, bone formation may occur within muscle or connective tissues, leading to myositis ossificans. Patients often present with swelling, pain, and limited extension of the elbow joint. Treatment may include indomethacin enteric-coated tablets or hydrocortisone tablets, used according to medical advice.

In addition, these symptoms may also be associated with conditions such as rheumatoid arthritis or bone tumors. It is recommended that patients seek timely medical evaluation upon experiencing the above symptoms, complete necessary diagnostic tests, identify the exact cause, and follow physician-guided treatment to avoid disease progression.