If you have axillary pain spreading to under your left arm, and this is what worries you.

If you want to know the causes of armpit and left arm pain.

What you will read next:


The axillary area is a very sensitive area. This area has sensitive organs and tissues such as the blood vessels of the lymph nodes and important nerves.

Due to the presence of these tissues in the right armpit and left armpit area, it will be normal for you to feel pain and discomfort in these areas.

Pain in the left armpit and left arm can be wide in severity.

Left armpit pain can be very mild and can be severe, and on the other hand, it can be severe, serious and annoying.

It is said that most of the causes that are associated with the armpit, spreading to the left arm will be either infections or inflammation or irritation of the skin.

As we have said, although most of the causes of left axillary pain are not serious, there are cases in the left armpit and under the left arm caused by serious problems such as tumors and malignancies.

What are the causes of left armpit pain?

If you are a group of people who suffer from left armpit or left arm pain and are looking for possible causes, you should know that different types of causes may manifest themselves with armpit pain.

In the following, we will mention these reasons and give a brief explanation about each of them.

Reasons for a brief explanation of each

  1. The first cause: Allergic reactions:

If you are one of those people who use perfumes, lotions, body washes and deodorants on a regular basis, know that doctors say that the contents of these fragrances may normally irritate your skin.

If you have sensitive skin or have an underlying skin disorder, it is more likely that any of the above substances will irritate your skin and cause allergic reactions and pain.

Accompanying symptoms associated with this disease

In these cases, there are symptoms associated with irritated skin. Some of these symptoms will be as follows:

  • Inflammation of the left armpit
  • Redness of the left armpit
  • Left armpit swelling
  • Itching of the left armpit
  • Warmness of the skin surface
  • Left axillary skin rashes

If you have an allergic reaction following the use of a fragrance or cosmetic product that has the above symptoms, you should first stop using the product and contact your doctor immediately. Prompt notification to your doctor will be necessary to prevent more serious symptoms.

  1. The second reason: shaving the left armpit:

If you use slow and inefficient razors and tools to remove hair under your armpits, if you use old and dirty razors to shave these areas, know that you are at high risk of irritation, inflammation and even infection of the skin in this area.

Due to the use of slow and contaminated tools such as dirty razors, the hair follicles in the area become inflamed.

Folliculitis can be accompanied by pain, irritation, and discomfort in the armpits. There may also be painful, inflamed bumps or subcutaneous hair in the area.

Inhalation of bad breath is also common if folliculitis becomes infected.

  1. The third cause: Infections:

Bacterial skin infections are a well-known and common cause that can cause pain and discomfort in your armpits.

Infectious bacteria can grow easily in humid and hot environments such as the armpits, so it is very common for bacteria to grow in these areas to cause inflammation, pain, swelling and redness of the skin.

Fungi can also cause skin infections in the axilla.

A common medical condition called purulent hidradenitis can cause itching, pain and discomfort in the left armpit.

Purulent hidradenitis actually occurs when the outlet duct of the hair follicles and sebaceous glands is blocked.

Purulent hidradenitis is more common in the left and right armpits and in the groin, and people sometimes refer to purulent hidradenitis as a severe and widespread form of acne, When the immune system is over-activated to eliminate inflammation, it appears that it leaves thick or deep scars at the site of the skin infection.

In the presence of purulent hidradenitis in the left armpit, in addition to axillary and left arm pain, the following symptoms may be present:

  • Tenderness and sensitivity of the area to touch
  • Itching
  • Existence of multiple blisters and cysts
  • Occurrence of recurrent infections

For the treatment of axillary skin infections associated with pain, your doctor will usually prescribe appropriate antibiotics or antifungals.

If purulent hidradenitis is present, in addition to prescribing and taking anti-inflammatory drugs, surgery will often be necessary. Antibiotics will also be used for larger infections.

  1. The fourth cause: muscle strains:

Stretching the muscles in the chest and around the shoulder blade and left arm may cause pain in the armpit and spread to under your left arm.

These pains are usually common in people who have lifted a stone or a heavy object

Also, athletes who participate in sports that have a lot of mobility in the upper torso and shoulders during the competition will be more likely to suffer from Pain in the armpits and under the arm on the right and left.

In cases where the severity of the symptoms is mild, muscle strain and inflammation and pain will heal enough with a week’s rest, but if your armpit pain does not go away after a week, or if you notice a bulge in your armpit or left arm, you should Be sure to see your doctor.

the presence of a bulge can indicate a rupture of muscles in the area that this condition will require medical treatment.

  1. The fifth cause: Shingles:

Shingles is a neurological infectious disease. The varicella zoster virus, which causes chickenpox, can cause shingles in the elderly or people with immunodeficiency.

The following symptoms occur in shingles:

  • There is severe pain in the area before the onset of shingles.
  • Tingling sensation in the area
  • Burning or itching sensation
  • The appearance of large and painful blisters

It should be noted that the back of the chest, armpits and abdomen are common areas for shingles.

The important point is that the involvement in the shingles will be on one side of the body and along a certain dermatome.

Oral antiviral treatment is necessary to treat shingles. Your doctor will use anti-inflammatory drugs and painkillers to relieve the pain.

  1. The sixth cause: cardiac angina:

Angina refers to chest pain caused by ischemia of the heart muscle.

Myocardial ischemia means that due to narrowing or blockage of the arteries supplying the myocardium, oxygen supply to the myocardium is interrupted. Disruption of blood flow and oxygenation causes pain known as ischemic pain. Myocardial ischemia causes chest pain or angina.

Angina will last for about one to twenty minutes. If the blockage of the arteries continues, a heart attack will occur.

If angina persists, a heart attack may occur. In a heart attack or stroke, the pain lasts for even more than 30 minutes.

The symptoms and manifestations of angina and myocardial infarction will be almost identical.

Note the symptoms of angina and myocardial infarction below:

  • Chest pain that can spread to the lower jaw, neck, right and left shoulders, right arm and left arm, hands, armpits and above the abdomen to the top of the navel.
  • Feeling of heavy pressure and burning in the chest
  • Nausea
  • Vomit
  • Abundant cold sweats
  • Difficult breathing
  • lightheadedness
  • Vertigo
  • Fatigue and weakness
  • Change heart rate
  • Respiratory problems

We emphasize that if you have pain in the left armpit and left arm and you also experience one or more of the above symptoms, you should go to the nearest medical center immediately or call the emergency room.

  1. Seventh reason: Breast cancers:

It is important to know that the presence of cancers does not require a lump or bulge in the breast

In the early stages of breast cancer, the symptoms and manifestations are very small. As the disease progresses, the malignant cells move out of the breast, by spreading malignant cells to the axillary lymph nodes




And left armpit pain occurs.

Treatment for breast cancer depends on the type of tumor and the stage in which the tumor is located.

  1. The eighth reason: Swelling of the lymph nodes

There are several lymph nodes throughout the body.

One of the areas where lymph nodes accumulate is the axilla.

The left and right armpits have a large number of lymph nodes.

Lymph nodes are part of the immune system that are responsible for fighting infectious agents.

When the body is exposed to bacterial and viral infections, the lymph nodes may become enlarged and swollen, causing axillary pain in the right or left side.


When should we see a doctor despite left armpit pain?

We said that if the irritation and stretching of the left armpit muscle is mild, it will improve with rest within a week, but if you have armpit or left arm pain that is accompanied by one or more of the following symptoms, you should see a doctor immediately:

  • Shortness of breath, sweating
  • Chest pain
  • Feeling of pressure and heaviness on the chest
  • Lower jaw pain
  • Upper abdominal pain
  • Excessive sweating
  • nausea and vomiting
  • Increase or decrease the heart rate
  • Changed heart rhythm
  • Weakness and fatigue
  • Lightheadedness
  • Dizziness
  • Loss of consciousness
  • Also, if you have muscle strain and your pain does not decrease after seven days of rest, or if there is a bulge and swelling in your armpit or left arm, you should see a doctor for examination and treatment.

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