Pain in the left upper chest near the armpit may be caused by trauma, pneumonia, pneumothorax, angina, lung cancer, pleurisy, intercostal neuralgia and so on.
1. Trauma: This symptom may occur when the left upper chest position is hit, squeezed, pulled, punctured and other traumatic injuries, resulting in localized skin breakage, subcutaneous hematoma, muscle strain, fracture and so on.
2. Pneumonia: This symptom occurs when the left upper lung is infected by bacteria, virus, mycoplasma, chlamydia, mycobacteria and other pathogens, resulting in inflammatory reactions such as hemorrhage and exudation.
3. Pneumothorax: when the surface of the left upper lung or the surface of the left upper chest wall is broken, the external gas enters the pleural cavity under the effect of atmospheric pressure, which leads to an increase in the local pressure and the emergence of this symptom.
4. Angina pectoris: angina pectoris occurs due to myocardial ischemia caused by atherosclerotic stenosis of coronary arteries and spasm of coronary arteries, which can radiate to the back of left shoulder.
5. Lung cancer: when left upper lung cancer is in the middle or late stage, it invades into pleura and stimulates rich sensory nerve fibers in pleura, thus causing this symptom.
6. Pleurisy: Inflammatory lesions appear in pleura due to infection, autoimmune disease, tumor and other factors, and local oozing, adhesion and bleeding cause this symptom.
7. Intercostal neuralgia: Inflammation, trauma and other factors lead to inflammatory lesions of intercostal nerves, which cause tingling distributed radially along the intercostal space.
The pain in the left upper chest near the armpit may be related to a variety of factors, and it is recommended to consult a doctor for a clear diagnosis.