Pain in One Arm Symptoms, Causes & Common Questions

Understand your pain in one arm symptoms, including 10 causes & common questions.

Pain In One Arm Symptom Checker

Take a quiz to find out what might be causing your pain in one arm

Contents

  1. 10 Possible Pain In One Arm Causes
  2. Real-Life Stories
  3. Questions Your Doctor May Ask
  4. Statistics
  5. Related Articles

10 Possible Pain In One Arm Causes

The list below shows results from the use of our quiz by Buoy users who experienced pain in one arm. This list does not constitute medical advice and may not accurately represent what you have.

Brachial plexopathy (shoulder nerve issue)

The brachial plexus is a web of nerves between the neck and shoulder, connecting the spinal cord nerves to the arm. There is one web on each side of the neck. Any injury that forces the shoulder to stretch down, and the neck to stretch up and away, can damage these nerves and cause brachial plexopathy.

Sports injuries and car accidents are often involved. Inflammation, tumors, and radiation treatment can also damage the brachial plexus.

Milder symptoms include numbness and weakness in the arm, with a shocklike stinging or burning sensation. A more severe injury can cause paralysis and loss of feeling in the arm, with pain in some parts of the arm, hand, and shoulder.

These symptoms should be seen by a medical provider since permanent damage can result if the injuries are not treated.

Diagnosis is made through electromyography (EMG) testing, CT scan, MRI, and sometimes angiogram.

Treatment usually involves rest and physical therapy. Surgery may be necessary to remove scar tissue or repair the damaged nerves.

Rarity: Uncommon

Top Symptoms: pain in one arm, shoulder pain that shoots to the arm, arm weakness, numbness in one arm, shoulder pain

Symptoms that never occur with brachial plexopathy (shoulder nerve issue): pain in the front middle part of the neck

Urgency: Primary care doctor

Forearm strain from a repetitive injury

Repetitive strain injury of the forearm is caused by constantly using the wrist.

Rarity: Uncommon

Top Symptoms: forearm numbness, forearm weakness, forearm pain from overuse

Symptoms that always occur with forearm strain from a repetitive injury: forearm pain from overuse

Symptoms that never occur with forearm strain from a repetitive injury: severe forearm pain, forearm injury

Urgency: Self-treatment

Ulnar nerve entrapment of elbow

Ulnar nerve entrapment of elbow is also called cubital tunnel syndrome. The ulnar nerve begins at the spinal cord in the neck and runs down the arm into the hand. This very long nerve can become compressed, or entrapped, by other structures at certain points along the way. Entrapment often happens in the cubital tunnel, which is the narrow passage at the inside of the elbow.

The exact cause for entrapment may not be known. Fluid buildup and swelling inside the elbow; previous elbow fracture or dislocation; or leaning on the elbow for long periods of time can put pressure on the ulnar nerve inside the cubital tunnel.

Symptoms include numbness and tingling of the hand and fingers, sometimes leading to weakness and even muscle wasting in the hand.

Diagnosis is made through physical examination, x-ray, and nerve conduction studies.

Treatment begins with wearing a supportive brace and adjusting activities to avoid further irritating the nerve. Surgery is usually not needed unless the nerve compression is causing weakness and loss of use in the hand.

Rarity: Common

Top Symptoms: hand weakness, weakness in one hand, numbness in one hand, pain in one elbow, pain in one forearm

Urgency: Primary care doctor

Repetitive strain injury of the upper arm

Repetitive strain injury of the upper arm is caused by consistent repetitive use.

Rarity: Uncommon

Top Symptoms: upper arm pain from overuse, upper arm weakness, upper arm numbness

Symptoms that always occur with repetitive strain injury of the upper arm: upper arm pain from overuse

Symptoms that never occur with repetitive strain injury of the upper arm: upper arm injury, severe upper arm pain

Urgency: Self-treatment

Thoracic outlet syndrome

The "thoracic outlet" is the space on either side of the base of the neck where nerves, arteries, and veins travel beneath the collarbone. If these become compressed or damaged, the condition is called thoracic outlet syndrome or TOS.

The most common causes are trauma, such as a car accident or fall; and repetition or overuse, such as a sports injury.

Symptoms vary depending on the structures being compressed:

  • Neurogenic TOS affects the nerves. It is the most common form and creates numbness, tingling, pain, and weakness in the arms, hand, and fingers.
  • Vascular TOS affects the arteries and veins. It creates the same symptoms as neurogenic TOS as well as cold, pale hands and arms with weak pulse.

It is important to see a medical provider about these symptoms so that the damage does not become permanent.

Diagnosis is made through patient history, physical examination, imaging such as x-ray or ultrasound, and sometimes nerve conduction and blood flow studies.

Treatment involves physical therapy, pain relievers, and sometimes surgery.

Rarity: Rare

Top Symptoms: pain in one shoulder, spontaneous shoulder pain, arm weakness, arm numbness, pain in one shoulder blade

Urgency: Primary care doctor

Pain In One Arm Symptom Checker

Take a quiz to find out what might be causing your pain in one arm

Skin abscess

A skin abscess is a large pocket of pus that has formed just beneath the skin. It is caused by bacteria getting under the skin, usually through a small cut or scratch, and beginning to multiply. The body fights the invasion with white blood cells, which kill some of the infected tissue but form pus within the cavity that remains.

Symptoms include a large, red, swollen, painful lump of pus anywhere on the body beneath the skin. There may be fever, chills, and body aches from the infection.

If not treated, there is the risk of an abscess enlarging, spreading, and causing serious illness.

Diagnosis is made through physical examination.

A small abscess may heal on its own, through the body's immune system. But some will need to be drained or lanced in a medical provider's office so that the pus can be cleaned out. Antibiotics are usually prescribed.

Keeping the skin clean, and using only clean clothes and towels, will help to make sure that the abscess does not recur.

Rarity: Common

Top Symptoms: rash with bumps or blisters, red rash, red skin bump larger than 1/2 cm in diameter, pus-filled rash, rash

Symptoms that always occur with skin abscess: rash with bumps or blisters

Urgency: Primary care doctor

Skin cyst

A cyst is a small sac or lump, filled with fluid, air, fat, or other material, that begins to grow somewhere in the body for no apparent reason. A skin cyst is one that forms just beneath the skin.

It's believed that skin cysts form around trapped keratin cells – the cells that form the relatively tough outer layer of the skin.

These cysts are not contagious.

Anyone can get a skin cyst, but they are most common in those who are over age 18, have acne, or have injured the skin.

Symptoms include the appearance of a small, rounded lump under the skin. Cysts are normally painless unless infected, when they will be reddened and sore and contain pus.

Diagnosis is made through physical examination. A small cyst can be left alone, though if it is unsightly or large enough to interfere with movement it can be removed in a simple procedure done in a doctor's office. An infected cyst must be treated so that the infection does not spread.

Rarity: Common

Top Symptoms: skin-colored armpit bump, marble sized armpit lump, small armpit lump

Symptoms that always occur with skin cyst: skin-colored armpit bump

Urgency: Wait and watch

Carpal tunnel syndrome

Carpal tunnel syndrome is a condition of numbness and tingling in the hand and arm caused by compression of the mediannerve as it travels through the carpal tunnel. Causes include overuse of the wrist and hand, especially highly repetitive activities such as typing or wo...

Read more

Rheumatoid arthritis

Arthritis is a general term for multiple conditions that cause painful inflammation and stiffness throughout the body. Rheumatoid arthritis (RA) is a chronic condition that is autoimmune in nature, meaning that the body's immune system which normally protects the body by att...

Read more

Deep vein thrombosis

Deep vein thrombosis (DVT) is a blood clot that forms in a vein deep in the body. Most deep vein clots occur in the lower leg or thigh.

Rarity: Uncommon

Top Symptoms: fever, thigh pain, upper leg swelling, calf pain, butt pain

Urgency: Hospital emergency room

Share your story with others

Once your story is reviewed and approved by our editors, it will live on Buoy as a helpful resource for anyone who may be dealing with something similar.

Questions Your Doctor May Ask About Pain In One Arm

To diagnose this condition, your doctor would likely ask the following questions:

  • Any fever today or during the last week?
  • What is your body mass?
  • Are you experiencing a headache?
  • Have you ever been diagnosed with diabetes?

If you've answered yes to one or more of these questions

Please take a quiz to find out what might be causing your pain in one arm. These questions are also covered.

Take quiz

Pain In One Arm Symptom Checker Statistics

People who have experienced pain in one arm have also experienced:

  • 14% Pain In One Shoulder
  • 6% Rib Pain On One Side
  • 4% Rib Pain

People who have experienced pain in one arm were most often matched with:

  • 42% Brachial Plexopathy (Shoulder Nerve Issue)
  • 42% Ulnar Nerve Entrapment Of Elbow
  • 14% Forearm Strain From A Repetitive Injury

Source: Aggregated and anonymized results from Buoy Assistant (a.k.a. the quiz).

Pain In One Arm Symptom Checker

Take a quiz to find out what might be causing your pain in one arm

No ads, doctor reviewed. Let's crack your symptom code together - like us on Facebook to follow along.