What Are the 6 Causes of Pain Under the Armpits? Should You Remove a Lump?
Pain under the armpits isn’t something most people experience regularly. But when it does occur, it can be concerning. The armpit area contains various muscles, nerves, and lymph nodes, which can all become sources of discomfort when something goes wrong. While some causes of pain are minor, others may signal more serious health conditions.
Here, we’ll explore six common causes of pain under the left or right armpit and discuss whether you should remove a lump when it appears. While experiencing armpit pain doesn’t always point to a specific illness, persistent or severe pain warrants medical attention for a proper diagnosis.
1. Lymphadenitis
Lymphadenitis and Armpit Pain
Lymphadenitis is the inflammation of the lymph nodes, which can occur in the armpit. The lymphatic system helps remove waste and supports immune function, but when these nodes become infected or swollen, they cause pain. This condition can be caused by bacterial infections, tuberculosis, or even cancers.
If you feel a lump and it’s tender to the touch, it could be lymphadenitis. In most cases, the lump may not require treatment if it’s benign. However, if it’s linked to an infection or more serious issues like cancer, appropriate treatment is necessary. Early diagnosis and treatment are important, especially if it’s caused by an infection or a tumor.
2. Accessory Breast Tissue
Accessory Breast Tissue and Armpit Pain
Accessory breast tissue is when extra breast tissue forms outside the normal breast area, usually near the armpit. This condition can cause pain and lumps that feel similar to a benign tumor. According to research, about 2% of women experience accessory breast tissue, often located near the armpit or lower chest area.
Although accessory breast tissue rarely requires removal, it may be surgically removed if it causes pain or cosmetic concerns. Most of the time, it’s a benign condition that doesn’t pose serious health risks, but a proper examination can confirm the diagnosis.
3. Serratus Muscle Strain
Serratus Muscle Strain and Armpit Pain
The serratus anterior muscle, which lies beneath the shoulder blade, can cause armpit pain when strained. Activities like heavy lifting, sports, or repetitive movements can strain this muscle, leading to pain in the armpit area.
The best treatment for this strain is rest and recovery. Avoiding intense physical activity and gradually increasing exercise intensity can help prevent recurring strain. Proper stretching and strength-building exercises may also reduce the risk of muscle strain in the future.
4. Myofascial Pain Syndrome
Myofascial Pain Syndrome and Armpit Pain
Myofascial pain syndrome occurs when the fascia, a layer of connective tissue around muscles, becomes irritated. This condition can affect various areas of the body, including the neck, shoulders, and armpits. When tension or pain in the neck radiates to the armpit, it could indicate myofascial pain syndrome.
To treat this condition, relaxation techniques like massage, stretching, and heat therapy can be helpful. Additionally, ensuring that you don’t overstrain muscles can reduce the frequency of myofascial pain syndrome. Targeted physical therapy may also help manage and reduce the pain.
5. Rib Fractures
Rib Fractures and Armpit Pain
Pain under the armpit can sometimes be confused with pain from a rib fracture. The ribs are essential for protecting vital organs, but fractures to the upper ribs can cause pain near the armpit area. Breathing may become painful, but surgery is typically not required unless an internal organ is damaged.
Pain from rib fractures usually resolves with rest, although it can last for weeks. If pain persists for an extended period or is accompanied by trouble breathing, it’s important to see a doctor for further evaluation.
6. Cervical Disc Herniation
Cervical Disc Herniation and Armpit Pain
A herniated disc in the neck can press on the nerves that supply the armpit area, causing pain, tingling, and numbness that may radiate down the arms. If left untreated, cervical disc herniation can cause chronic pain and weakness in the arms and hands, and in severe cases, paralysis.
Early treatment, such as physical therapy or medication, can help alleviate symptoms and prevent the condition from worsening. In more severe cases, surgery may be necessary to address the herniated disc and prevent nerve damage.
When to Seek Medical Attention
If you experience pain under your armpit, especially with the presence of a lump, it’s important to pay attention to how the symptoms develop. Not all cases are serious, but if the pain persists, intensifies, or is accompanied by a lump, it’s essential to consult a healthcare provider for further evaluation.
Lymphadenitis, accessory breast tissue, and even rib fractures may cause armpit pain, but it’s important to rule out more serious conditions, such as tumors or infections. Early diagnosis and treatment can prevent complications and help relieve symptoms.