Pain on the right side above the chest near the armpit may be related to trauma, muscle strain, intercostal neuritis and other causes. 1. Trauma: when the right upper chest near the armpit is hit by a wooden stick or other injuries, it can cause local tissue congestion and swelling, and the symptoms of pain appear. 2. Muscle strain: In sports activities such as lifting the bar, improper operation may cause pain when the muscle above the chest near the armpit is strained. 3. Intercostal neuritis: If you suffer from intercostal neuritis, under the stimulation of inflammatory factors, you may experience pain on the right side of the chest near the armpit. There may be other reasons for the pain on the right side of the chest near the armpit, it is recommended to go to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.