Why is it painful to straighten my arm?
Emma Payne
Published Jan 17, 2026
Tennis elbow, or lateral epicondylitis, is a painful inflammation of the elbow joint caused by repetitive stress (overuse). The pain is located on the outside (lateral side) of the elbow, but may radiate down the back of your forearm. You'll likely feel the pain when you straighten or fully extend your arm.
Why does my arm hurt when I try to straighten it?
Biceps tendinitis — Biceps tendinitis is the inflammation of your biceps tendon, which connects your biceps muscle to the inside of your elbow joint. Overexerting your elbow by lifting heavy objects can cause irritation to this tendon, which can be felt when trying to straighten or bend your elbow.
Why is it hard to straighten my arm?
A person who cannot fully bend or straighten the elbow after an injury should see a doctor. Strain: A strain is the medical term used when muscles are torn or over-stretched. A more common term for this is a "pulled muscle." Minor strains often heal with just time and rest. Surgery is rarely needed for a muscle strain.
Why does my arm hurt to bend and straighten?
Tennis Elbow (Lateral Epicondylitis) Anyone can get tennis elbow (lateral epicondylitis), not just athletes. Repetitive arm motions weaken arm muscles and tear the tendons that attach muscle to bone. Tennis elbow can cause pain when you bend or straighten your arms or grasp or lift items.
How do I know if my elbow pain is serious?
Call your doctor right away if you have:
- Severe pain, swelling and bruising around the joint.
- Trouble moving your elbow normally, using your arm or turning your arm from palm up to palm down and vice versa.
What does arthritis in elbow feel like?
Elbow Arthritis Symptoms
You may have elbow arthritis if you experience any of the following symptoms: Elbow pain. Grinding, popping or cracking of the elbow joint. Stiffness or a decreased range of motion.
What does bursitis in the elbow feel like?
Symptoms of elbow bursitis include: Swelling around your elbow. Pain, including when you move your elbow. Discoloration and warmth (if the bursitis is caused by an infection).
What is Forarm?
Introduction. The forearm of the upper extremity runs from the elbow to the wrist. Two bones, the radius laterally and the ulna medially, form the forearm. It has two compartments, the anterior (flexor) and posterior (extensor). The two compartments together have twenty muscles.
How do you treat forearm tendonitis?
That helps reduce inflammation and promote recovery.
- Rest. The forearm is involved in many different motions. ...
- Ice. ...
- Compression. ...
- Elevation. ...
- Downward wrist stretch.
- Weight curls.
- Massage balls or foam roller.
- Rubber band stretch.
What happens if tennis elbow goes untreated?
Tennis elbow does not usually lead to serious problems. If the condition continues and is left untreated, however, loss of motion or loss of function of the elbow and forearm can develop.
Why does the point of my elbow hurt?
Elbow pain is often caused by overuse. Many sports, hobbies and jobs require repetitive hand, wrist or arm movements. Elbow pain may occasionally be due to arthritis, but in general, your elbow joint is much less prone to wear-and-tear damage than are many other joints.
Why does the outside of my elbow hurt?
Lateral epicondylitis, or tennis elbow, is swelling or tearing of the tendons that bend your wrist backward away from your palm. It's caused by repetitive motion of the forearm muscles, which attach to the outside of your elbow. The muscles and tendons become sore from excessive strain.
Why does my bicep hurt when I extend my arm?
Bicep tendonitis is an inflammation of the tendons that connect the biceps muscle, at the front of your arm, to the shoulder and the elbow. A repetitive motion injury, bicep tendonitis often results from overuse caused by a repeated overhead motion.
Why does it hurt to extend my arm after working out?
However, if you literally can't straighten your arm a few days after a round of bicep curls, it's probably time to call the doctor. Brickner says that this is a sign of rhabdomyolysis, a severe injury to the muscles from an excessive workout. Extreme exercise can actually cause cell death of the muscles themselves.
Why does the outside of my upper arm hurt?
Shoulder tendinitis, bursitis, and impingement are among the most common overuse injuries of the shoulder. The pain is usually felt at the tip of the shoulder and down the upper arm. The pain occurs when the arm is lifted overhead or twisted.
How do you relieve arm pain?
Self-care
- Rest. Take a break from your normal activities.
- Ice. Place an ice pack or bag of frozen peas on the sore area for 15 to 20 minutes three times a day.
- Compression. Use a compression bandage to reduce swelling.
- Elevation. If possible, elevate your arm to help reduce swelling.
Why does my elbow hurt when I straighten my arm?
Tennis elbow, or lateral epicondylitis, is a painful inflammation of the elbow joint caused by repetitive stress (overuse). The pain is located on the outside (lateral side) of the elbow, but may radiate down the back of your forearm. You'll likely feel the pain when you straighten or fully extend your arm.
What does a forearm muscle tear feel like?
Forearm Pain. Forearm pain manifests itself between the wrist and the elbow. The pain resulting from a forearm injury is experienced as tenderness, ache, tightness and often an inability to perform repetitive tasks.
What happens if tendonitis goes untreated?
If tendonitis is left untreated, you could develop chronic tendonitis, a tendon rupture (a complete tear of the tendon), or tendonosis (which is degenerative). Chronic tendonitis can cause the tendon to degenerate and weaken over time.
What is posterior forearm?
The posterior compartment of the forearm (or extensor compartment) contains twelve muscles which are chiefly responsible for extension of the wrist and digits, and supination of the forearm. It is separated from the anterior compartment by the interosseous membrane between the radius and ulna.
What does Antebrachium mean?
Medical Definition of antebrachium
: the part of the arm or forelimb between the brachium and the carpus : forearm.
What are the 2 bones in your arm called?
Your arm is made up of three bones: the upper arm bone (humerus) and two forearm bones (the ulna and the radius).
What is Popeyes elbow?
Bursitis is an inflammation of small sacs of fluid (bursae) that help joints move smoothly. Olecranon bursitis, which affects the olecranon bursa at the back of the elbow, is sometimes called Popeye elbow. This is because the bump that develops at the back of the elbow looks like the cartoon character Popeye's elbow.
Is bursitis serious?
If septic bursitis is left untreated, the fluid inside the bursa can turn to pus. In addition, the infection can spread to the bloodstream and other parts of the body. If the infection spreads, symptoms will become worse and the infection can even become life-threatening.
How serious is elbow bursitis?
If the bursa is infected, the skin becomes red and warm. If the infection is not treated right away, it may spread to other parts of the arm or move into the bloodstream. This can cause serious illness. Occasionally, an infected bursa will open spontaneously and drain pus.