Understand swollen shoulder symptoms, including 8 causes & common questions.
Symptoms of a swollen shoulder
Swelling, or is the result of fluid buildup that gets trapped in your body's tissues. Fluid buildup can occur when an area of the body becomes inflamed, injured or damaged. The small blood vessels in the body begin to leak fluid. Moreover, the body can bring in white blood cells to repair the damage, and more fluid follows. Depending on the cause, the swelling can be generalized and occur throughout the body, or localized and only affect a specific part of the body.
Common characteristics of a swollen shoulder
- Bruising in the shoulder area
- Warmth or redness of the affected area
- Limited range of motion
- Decreased strength
- A feeling of instability in the shoulder
- A visibly deformed or out-of-place shoulder
Seek prompt medical attention if you suspect shoulder swelling as it is often a sign of an underlying injury or chronic condition.
What causes a swollen shoulder
The shoulder is a very mobile joint and vulnerable to injury. The shoulder joint consists of the shoulder blade (scapula), the collarbone (clavicle) and the bone of the upper arm (humerus). The head of the humerus sits in a socket of the scapula (glenoid). There is a ring of tissue that surrounds the glenoid socket (labrum) that keeps all of these pieces in place.
- Falling on an outstretched arm
- Direct blow: A direct blow to the shoulder can resultfrom a motor vehicle accident or even falling from a bicycle.
- A sudden, forceful pull: For example, when trying to lift a heavy object from the ground.
- : This can occur in the system of bones, sockets, and tissue of the shoulder, causing the shoulder to feel as if it has popped out of place.
Activities that cause repetitive shoulder motions such as tennis or weightlifting can cause an overuse injury to the shoulder joint. Repetitive overhead motions you may perform at work can also cause such overuse injuries and lead to symptoms of swelling and pain.
Shoulder swelling can be due to processes that occur as you age, such as the following.
- Normal wear-and-tear: Wear-and-tear over a long period of time can weaken the shoulder joint. As a result, people over the age of 40 are more susceptible to such symptoms. With advanced age, the greater the exposure to situations that weaken the shoulder system lead to a breakdown of the tissues and ligaments surrounding the joint.
- Rheumatologic: This category includes inflammatory conditions involving the body's tissues and joints that often affect people of older age. Conditions such as arthritis cause inflammation that easily brings fluid into the tissues, leading to swelling, redness, and tenderness in the joints.
This list does not constitute medical advice and may not accurately represent what you have.
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Acromioclavicular (ac) shoulder joint injury
The shoulder is made up of three bones - the shoulder blade (scapula), collar bone (clavicle), and arm bone (humerus). The acromioclavicular (AC) joint is a joint that is in the front of the shoulder, where the collar bone and shoulder blade meet. This joint is stabilized by ligaments, which can tear if the two bones are separated from one another. This is most commonly caused by falling on the shoulder.
Top Symptoms: constant shoulder pain, pain in one shoulder, shoulder pain from an injury, shoulder pain near the end of the collarbone, difficulty moving the shoulder
Symptoms that always occur with acromioclavicular (ac) shoulder joint injury: shoulder pain near the end of the collarbone, constant shoulder pain
Urgency: Primary care doctor
Shoulder strain means that the muscles and/or the tendons in the shoulder have been overstretched to the point of damage and sometimes partial tearing. (A "sprain" means that ligaments have been damaged.)
Because of its wide range of motion, the shoulder is a relatively unstable joint that is vulnerable to injury. A sudden overloading, especially after long periods of overuse, can finally cause some degree of tearing to the muscle fibers and/or the tendons.
Shoulder strains are most often sports injuries, or are caused by strenuous physical labor.
Symptoms include sudden sharp pain followed by swelling, bruising, and ongoing tenderness.
Diagnosis is made through patient history, physical examination, and sometimes ultrasound.
Treatment involves a short period of rest, followed by gradually increasing exercise to regain strength and prevent stiffness and weakness of the muscles and tendons. Physical therapy will be tailored to the individual and some skills, such as for sports, may need to be relearned. Improving posture while sitting, and adjusting techniques for work and sports, can help prevent recurrence of the strain.
Top Symptoms: pain in one shoulder, pain in the front of the shoulder, shoulder pain from overuse, shoulder pain from an injury, sports injury
Symptoms that always occur with shoulder strain: pain in one shoulder
Symptoms that never occur with shoulder strain: arm weakness, arm numbness
Urgency: Phone call or in-person visit
Biceps tendon rupture
The biceps muscle in the upper arm is anchored at the top by two separate tendons. One connects to the shoulder blade and one connects to the top of the shoulder joint. If one of these tendons is strained enough to completely tear it in two, this is called a rupture.
The injury is most common in people over age 40, especially after years of overuse of the shoulder. The person may have had episodes of biceps tendinitis in the past, which is a sign of fraying and damage to the tendon. In younger people it is primarily an acute sports injury, from weightlifting or from falling.
Symptoms include a pop or snap at the top of the shoulder, with sharp pain. There may soon be bruising halfway down the upper arm with obvious "balling up" of the partially disconnected muscle.
Diagnosis is made through patient history, physical examination, x-rays, and sometimes MRI.
Treatment involves over-the-counter anti-inflammatory medication; rest; ice; and physical therapy. Surgery may be done in some cases.
Top Symptoms: pain in one shoulder, pain in the front of the shoulder, spontaneous shoulder pain, dull, achy shoulder pain, shoulder pain that gets worse at night
Symptoms that always occur with biceps tendon rupture: pain in the front of the shoulder, pain in one shoulder
Urgency: Primary care doctor
A shoulder bruise, or contusion, means that the shoulder has been struck hard enough to damage the muscles without breaking the skin. This leaves a blue or purple mark in the skin that may be very sore.
A shoulder is most often bruised through a sports injury, such as blocking a player in a football game or falling from a horse. Using a rifle or shotgun can bruise the shoulder through the recoil.
A bruise may not seem serious, but it still needs proper care. It is possible for the bruise to mask a deeper injury such as a sprain, strain, or fracture. Complications such as compartment syndrome are possible, where trapped fluids from the damaged muscle tissues build up intense pressure and cause severe damage.
A medical provider can make an accurate diagnosis through physical examination and through imaging such as x-ray or CT scan.
Treatment for a shoulder contusion involves wearing a sling to take some pressure off of the shoulder joints; ice packs; and nonsteroidal anti-inflammatory drugs for pain and swelling.
Top Symptoms: constant shoulder pain, pain in one shoulder, shoulder pain from an injury, shoulder injury, swelling of one shoulder
Symptoms that always occur with shoulder bruise: shoulder pain from an injury, shoulder injury, constant shoulder pain
Swollen shoulder treatments and relief
When to see a doctor for a swollen shoulder
If you experience shoulder swelling or any of these associated symptoms, make an appointment with your physician to get appropriate treatment. Depending on the diagnosis, your physician may suggest:
- Repositioning: If your swelling is due to a dislocation injury, your physician may first attempt to reposition the upper arm back into the shoulder socket. This is usually done with IV sedation in an emergency department or urgent care setting for acute dislocations.
- Immobilization (sling): Your physician may use a sling to keep your shoulder from moving.
- Physical therapy or rehabilitation: Your physician may prescribe stretching exercises or a physical therapy/rehabilitation program to help you restore range of motion, strength, and stability to your shoulder, especially after injury.
- Rheumatologic medications: There are many types of medications that combat rheumatologic conditions that may be causing your swollen shoulder.
Questions your doctor may ask about swollen shoulder
- Is your swollen area warm and red?
- Any fever today or during the last week?
- What is your body mass?
- How would you explain the cause of your shoulder pain?
- Why Do Our Bodies Swell? 12 Surprising Reasons. UPMC Health Beat. Published November 29, 2016.
- Athwal GS, Widmer B. Shoulder Pain and Common Shoulder Problems. American Academy of Orthopaedic Surgeons: OrthoInfo. Updated March 2018.
- Shoulder Pain. American Society for Surgery of the Hand. Published 2015.
- Common Shoulder Injuries. American Academy of Orthopaedic Surgeons: OrthoInfo. Updated July 2009.
- Cutts S, Prempeh M, Drew S. Anterior Shoulder Dislocation. Annals The Royal College of Surgeons of England. 2009;91(1):2-7.