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The armpit, also known as the axilla, is the area on the human body directly under the shoulder joint. It includes the axillary space, an anatomical space within the shoulder girdle between the arm and the thoracic cage. The axilla contains several muscles, including the latissimus dorsi, teres major, and pectoralis major. The axilla also contains nerves, blood vessels, and lymph nodes. Muscle strain is a common cause of armpit pain, which can be treated with rest, ice, and over-the-counter medication. However, armpit pain can also be a symptom of more serious conditions, such as infection, cancer, or heart attack.
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What You'll Learn
Armpit pain and muscle strain
The armpit, or axilla, is the area on the human body directly under the shoulder joint. It includes the axillary space, an anatomical space within the shoulder girdle between the arm and the thoracic cage. The armpits and the surrounding chest and arm areas are made up of blood vessels, nerves, and muscles.
Armpit pain can be throbbing, aching, or sharp, and it can be occasional or constant. It can occur for many different reasons, ranging from minor issues such as skin irritation from shaving and muscle pulls to serious conditions like breast cancer. One common reason for armpit pain is muscle strain. Like other muscles in your body, you can strain the muscles around your armpit by overdoing things, like lifting something heavy or with repeated movements. Strained pectoral (chest) muscles, which people use for lifting and pulling, can often cause underarm pain. You might also strain the coracobrachialis (a muscle in your upper arm) during sports, such as baseball or tennis. If you sprain any of these or other muscles of your chest or upper arm, you could feel the pain in the armpit.
If you have armpit pain, think about what you might have been doing recently. Have you switched detergents or soap, or have you shaved recently? Have you lifted anything heavy, done more exercise than usual, or gotten hurt? These could be causes of armpit pain. If you’ve been feeling sick with a cold or some other illness, this could also be a cause. If the pain or lump doesn't go away within a couple of weeks, or if you start having other symptoms, like a fever, sweating, or the pain gets worse, see your doctor as soon as possible. It could be a sign of something serious.
If you have mild muscle strain, doctors suggest that you rest the muscles by taking a break from the activity that caused the pain. You can also put ice on the area and take over-the-counter medication to ease pain and swelling. Call your doctor if your symptoms get worse or the strain doesn’t heal within a few weeks.
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Lymph nodes and swelling
Lymph nodes are small, bean-shaped organs found throughout the body, connected by lymph vessels. They are a part of the body's immune system, filtering lymph fluid, which contains proteins, fats, white blood cells, cancer cells, bacteria, viruses, and more. Lymph is a watery fluid that carries oxygen to cells and transports waste products away from them. Lymph nodes are commonly found in the neck, armpits, and groin, and can be easily felt, especially when swollen.
Swelling of the lymph nodes can be a sign of bacterial or viral infection, an injury, or a serious health condition. The swelling could be a result of the lymph nodes filtering unwanted cells from the lymph as the body fights an infection. This is more common with certain infections, like the flu, infectious mononucleosis (glandular fever), or common skin infections like cellulitis, which can cause nearby lymph nodes to swell.
Swollen lymph nodes can also be a sign of more serious conditions, like cancer or lymphoma. Other possible causes include autoimmune conditions such as rheumatoid arthritis, lupus, and certain medications, like anti-seizure medication. If you experience swelling in the lymph nodes, it is important to consult a doctor, especially if the swelling is prolonged or accompanied by other symptoms like a fever or rash.
Armpit pain can be related to muscle strain, skin irritation, or swollen lymph nodes. The armpit, or axilla, is the space between the side of the thorax and the upper arm. It includes the axillary vein and artery, the brachial plexus, lymph nodes, and fat. The armpit area contains many hair and sweat glands and is where body odour mostly occurs.
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Skin conditions and irritation
Armpits are a common place for skin irritation due to the frequent contact between skin, clothing, and personal care products. The skin in the armpit area is thin and contains a high concentration of sweat glands, which can increase the risk of bacterial or fungal infections.
Skin Conditions
Skin conditions such as rashes are common in the armpit area due to the warm, moist environment. This environment may increase the risk of bacterial or fungal infections, such as yeast infections. Armpit rashes can be caused by various factors, including:
- Allergic reactions to personal care products, such as deodorants, soaps, or laundry detergents, known as allergic contact dermatitis.
- Skin irritation from shaving, such as razor burn or ingrown hairs.
- Folliculitis, which is an infection or inflammation of the hair follicles.
- Hidradenitis suppurativa, a chronic inflammatory condition that affects the sweat glands and hair follicles, causing painful bumps or cysts.
- Inverse psoriasis, which can cause a sore, itchy, and irritated rash.
- Ringworm, a fungal infection that causes an itchy, scaly rash.
- Shingles, which causes a painful and scaly rash.
Treatment
Mild armpit rashes caused by shaving irritation can often be treated at home by keeping the area clean and avoiding shaving or using products under the arms. Over-the-counter creams, anti-chafing powders, and topical steroids may also help reduce discomfort and treat the rash.
However, if the rash is severe, persistent, or accompanied by other symptoms, it is important to consult a healthcare provider. In some cases, prescription medications or other treatments may be necessary to resolve the issue.
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Armpit lumps and cancer
Armpit lumps are usually harmless and temporary, and they can occur in both men and women. They can be caused by swollen lymph nodes, which are part of the body's immune system and can become enlarged when fighting an infection. Other causes include cysts, skin irritation, and fatty growths. These lumps typically go away on their own and are rarely cancerous.
However, in rare cases, armpit lumps can indicate cancer, particularly in women, where they may be a sign of breast cancer. Lymph nodes act as filters that can catch germs or cancerous tumour cells. When they trap cancerous cells, lymph nodes can become enlarged and may feel hard and immobile. Other signs that an armpit lump may be cancerous include its persistence, a change in size, and a lack of redness or other signs of infection.
If you discover an armpit lump, it is important to monitor it and seek medical advice if it persists for more than a week or is accompanied by other symptoms. A doctor can determine the cause of the lump through a physical examination, medical history, and additional tests if necessary. While armpit lumps are usually benign, early detection and timely treatment are crucial for long-term health and peace of mind.
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Armpit anatomy and muscles
The armpit, or axilla, is the area on the human body directly under the shoulder joint. It includes the axillary space, an anatomical space within the shoulder girdle between the arm and the thoracic cage. The axilla is bounded superiorly by the plane between the superior borders of the first rib, clavicle, and scapula.
The axilla contains several muscles, including the serratus anterior, subscapularis, teres major, and latissimus dorsi. The serratus anterior muscle is located medially to the axilla, while the subscapularis, teres major, and latissimus dorsi muscles form the posterior boundary, called the posterior axillary fold. The pectoralis major and minor muscles contribute to the anterior boundary, known as the anterior axillary fold.
The axilla also houses the axillary vein and artery, the brachial plexus, lymph nodes, and adipose tissue. The axillary vein receives deoxygenated blood from tributaries such as the cephalic and basilic veins. The brachial plexus gives rise to peripheral nerves that supply the muscles of the shoulder girdle and chest and provide sensation to certain areas of the upper extremity.
The axillary region contains several important muscles, including the short head of the biceps brachii and the coracobrachialis. The coracobrachialis muscle assists in throwing and pushing motions, and its injury can cause armpit pain. The latissimus dorsi, which attaches to the humerus, helps move the shoulder and arm during reaching and pulling motions.
Armpit pain can be related to muscle strain, skin conditions, swollen lymph nodes, or, in rare cases, cancer. Muscle strain can occur due to overuse or repeated movements, leading to discomfort in the armpit and surrounding areas.
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Frequently asked questions
Yes, the armpit or axilla is an area of the body that includes several muscles, such as the serratus anterior, pectoralis major, and latissimus dorsi.
Armpit muscles are important for the proper functioning of the shoulders and arms. Without their use, individuals may overuse their necks and the fronts of their shoulders, leading to severe neck tension and potential shoulder injuries.
Armpit pain can be caused by various factors, including muscle strain, skin irritation, swollen lymph nodes, nerve compression, autoimmune disorders, and in some cases, cancer.
For mild muscle strains, doctors recommend resting the muscles, applying ice, and taking over-the-counter medication for pain and swelling. If symptoms persist or worsen, it is important to consult a doctor.
To strengthen armpit muscles, individuals can perform exercises such as "hand pumps supine," which involves using mini balls or soup cans to roll away from the shoulders without flaring the rib cage.
