A humerus fracture is a break in the upper arm bone, the single long bone that runs from your shoulder to your elbow. These fractures are grouped by where the break occurs: near the shoulder (proximal), along the middle of the bone (shaft), or near the elbow (distal). Each location brings different symptoms, risks, and treatment approaches, so the type you have shapes nearly everything about your recovery.
Where the Bone Breaks Matters
Your humerus has three distinct zones. The proximal end is the rounded top that fits into your shoulder socket. The shaft is the long midsection. The distal end flares out at the bottom to form part of your elbow joint. A fracture in any of these areas behaves differently because the surrounding muscles, nerves, and blood vessels vary along the length of the bone.
Proximal humerus fractures are the most common type, especially in older adults with weakened bones. A fall onto an outstretched hand or directly onto the shoulder is the usual cause. Over 85% of these fractures are minimally displaced, meaning the bone fragments haven’t shifted far out of position, and they can heal without surgery.
Shaft fractures often result from higher-energy injuries like car accidents, falls from height, or direct blows. They carry a notable risk of radial nerve damage because that nerve wraps closely around the middle of the humerus. About 12% of humerus shaft fractures injure the radial nerve, making it the most common nerve complication from any long bone fracture. When this happens, you may lose the ability to extend your wrist and fingers, a condition called wrist drop.
Distal humerus fractures, near the elbow, tend to be more complex because the bone at that end has an intricate shape that forms part of the elbow joint. In adults, these breaks frequently involve the joint surface itself, which makes alignment during healing especially important for preserving elbow motion.
How It Feels
The most obvious sign is sudden, severe pain in the upper arm after an injury. You’ll likely notice swelling and bruising that can spread down toward the elbow or even the forearm within the first day or two. Moving the arm, and sometimes even slight rotation, will be painful enough that most people instinctively cradle the arm against their body.
With proximal fractures near the shoulder, the pain concentrates at the top of the arm and lifting becomes impossible. Shaft fractures produce pain along the middle of the arm, and you may feel or hear a grinding sensation if the bone ends shift. Distal fractures cause pain and stiffness centered around the elbow, and bending or straightening the arm will be severely limited.
If the radial nerve is involved, you’ll notice weakness or complete inability to lift your hand at the wrist, along with numbness on the back of your hand between the thumb and index finger. Tingling, numbness, or coldness in the hand after any upper arm injury is a reason to seek care immediately, as it can signal nerve or blood vessel damage.
Humerus Fractures in Children
Children break the humerus differently than adults. The most common pediatric pattern is a supracondylar fracture, a break just above the elbow that typically happens when a child falls off playground equipment or a bike and lands on an outstretched arm. These fractures are classified on a scale from Type 1 (no displacement) through Type 3 (complete displacement) and a more controversial Type 4 where the bone is unstable in all directions.
The immediate concern with displaced supracondylar fractures in children is blood flow to the forearm and hand. Fewer than 10% of cases involve vascular compromise on arrival at the hospital, but when blood supply is threatened, treatment becomes urgent. Parents should check whether the child’s hand feels warm, whether color returns quickly when pressing a fingertip, and whether they can feel a pulse at the wrist. A cool, pale hand after an elbow injury needs emergency attention.
How Humerus Fractures Are Treated
Treatment depends on how far the bone fragments have shifted and which part of the humerus is broken. Most minimally displaced proximal fractures heal well without surgery. The arm is immobilized in a sling, and gentle movement is introduced gradually as the bone knits together.
For shaft fractures, a functional brace (sometimes called a Sarmiento brace) is one of the most common non-surgical options. This is a rigid cuff that wraps snugly around the upper arm, using the compression of surrounding soft tissue to hold the bone in alignment. Unlike a full cast, a functional brace allows your shoulder and elbow to move during rehab, which helps prevent stiffness. The arm is typically stabilized with a simple bandage first, and the brace is applied once initial swelling has gone down.
Surgery becomes necessary when bone fragments are significantly displaced (generally more than a centimeter apart or angled beyond 45 degrees), when the fracture extends into a joint surface, or when nerves or blood vessels are damaged. Surgical options range from plates and screws to pins or, in severe proximal fractures with multiple fragments, partial or total shoulder replacement. The specific approach depends on how many fragments are present and whether the blood supply to the bone’s top (the humeral head) has been disrupted.
The Healing Timeline
The bone typically begins to “glue” together between 4 and 8 weeks after the injury. During this early phase, you’ll wear a sling or brace and avoid lifting anything with the injured arm. Pain management and gentle pendulum exercises (letting the arm swing with gravity) are the main activities during these first weeks.
Around week 6, you can start returning to lighter daily tasks: getting dressed, eating, light housework. Your physical therapist will guide you through exercises to restore range of motion in the shoulder and elbow, which tend to stiffen during immobilization. Strengthening exercises come later, typically after the fracture shows solid healing on X-rays.
Full recovery, meaning a return to pre-injury strength and function, can take considerably longer than most people expect. While many people feel functional within 3 to 4 months, complete recovery can take up to two years. Older adults and those with more complex fractures tend toward the longer end of that range. Patience matters here: pushing too hard too early risks re-injury or chronic stiffness, while staying too cautious leads to muscle wasting and joint contracture.
Complications to Watch For
The most discussed complication is nonunion, where the fracture fails to heal. For proximal humerus fractures treated without surgery, the nonunion rate is roughly 1 to 1.3% in the general population. That number nearly doubles (to about 3%) in people with shoulder arthritis or rheumatoid arthritis. Smoking also significantly increases nonunion risk, giving you one more practical reason to quit if you’re recovering from a fracture.
Radial nerve palsy from shaft fractures usually recovers on its own. The nerve is bruised or stretched rather than severed in most cases, and function gradually returns over weeks to months. If wrist and finger movement hasn’t returned after several months, further testing and possible surgical exploration of the nerve may be needed.
Stiffness, particularly in the shoulder after proximal fractures and in the elbow after distal fractures, is common and sometimes permanent if rehabilitation is delayed or incomplete. Consistent physical therapy is the single most important thing you can do to protect long-term function. Even small, consistent daily exercises make a meaningful difference compared to skipping sessions and trying to catch up later.
Fractures That Need Urgent Attention
Most humerus fractures are painful but not emergencies in the strictest sense. A few situations change that. An open fracture, where bone pierces the skin, requires immediate surgical treatment to prevent infection. Any sign of compromised blood flow to the hand (cold fingers, absent pulse, pale or blue skin) demands emergency care. In children with supracondylar fractures, vascular compromise or developing compartment syndrome (rapidly increasing pain and tightness in the forearm) calls for immediate intervention, and imaging studies to evaluate blood vessels should not delay that treatment.