Cough and right armpit pain are considered to be related to pneumonia, pleurisy and intercostal neuritis. 1. Pneumonia: Pneumonia is related to bacterial, viral and other pathogenic microbial infections, and is also considered to be related to physical and chemical factors, allergies and so on. Typical symptoms of patients include fever, cough, sputum, chest pain, dyspnea, etc., which may be manifested as cough and right armpit pain. 2. Pleurisy: pathogen infection, injury, etc. can cause pleurisy, the main symptoms of patients have chest pain, chest tightness, shortness of breath, dyspnea, etc., and some patients may manifest cough, right armpit pain. 3. Intercostal neuritis: most patients are caused by herpes zoster infection, but also considered with nerve compression, trauma and other factors. Typical symptoms of patients have pain in the area innervated by intercostal nerves, which is easily aggravated after deep breathing and coughing, and can be manifested as cough and right armpit pain. There are other causes of cough and right armpit pain, so it is recommended that the patient seeks timely medical examination so that the disease can be clarified and treated according to the doctor’s instructions.