What causes pain under right arm pit?

Pain under the right armpit can have various causes, and it is important to note that pain in this area does not always indicate a serious medical condition. However, some potential causes include:

1. Muscle Strain or Sprain: Overexertion, injury, or repetitive movements can strain or sprain muscles or ligaments in the underarm area, causing pain.

2. Lymphadenitis: Inflammation of the lymph nodes under the armpit, often due to an infection or certain medical conditions, can lead to pain or tenderness in the armpit.

3. Breast-Related Conditions: For women, pain under the right armpit could be associated with breast-related issues, such as a blocked milk duct (in lactating women) or changes related to the menstrual cycle.

4. Arm Nerve Compression: Nerve compression, such as brachial neuritis or thoracic outlet syndrome, can cause pain that radiates from the neck and shoulder down to the armpit.

5. Skin Infections: Skin infections, such as boils or abscesses, in the armpit area can cause pain, swelling, and tenderness.

6. Hernias: A hernia, which occurs when an organ or tissue protrudes through a weakened area in the muscle or surrounding tissue, can cause pain under the armpit, particularly if it's an axillary hernia.

7. Respiratory Issues: In some cases, pain under the right armpit may be related to respiratory problems like pleurisy (inflammation of the lining of the lungs) or lung infections, especially if accompanied by respiratory symptoms.

8. Liver or Gallbladder Problems: Pain in the right upper abdomen or gallbladder region can sometimes be referred to the right armpit, indicating potential liver or gallbladder issues.

9. Gastrointestinal Conditions: Certain digestive problems, such as gastritis or stomach ulcers, can cause referred pain that feels like it's coming from the right armpit area.

10. Cardiovascular Conditions: Rarely, intense or prolonged pain in the right armpit could be related to cardiovascular conditions, like angina (chest pain due to reduced blood flow to the heart).

It is important to consult with a healthcare professional if the pain under the right armpit persists, worsens, or is accompanied by other symptoms, especially if there is fever, swelling, or difficulty breathing. They can accurately assess the cause of the pain and recommend appropriate treatment.