Common etiologies of chest pain on the left side include heart attack, angina, acid reflux, bronchitis and pneumonia, according to Healthline. A heart attack occurs when a blood clot blocks the blood supply in an artery to the heart.
A heart attack is a medical emergency. Symptoms of a heart attack include shortness of breath, chest pain, and a grey-blue tinge to the skin, according to Healthline.com. Angina is chest pain that occurs when there is not enough blood supply to the heart. Angina is also a medical emergency. People who are overweight and have diabetes have a higher risk of having angina.
Chest pain can also be due to acid reflux or heartburn, which is a condition where the contents of the stomach back flow into the esophagus. Acid reflux can cause a burning sensation in the chest, a bitter taste in the mouth, stomach pain and burping, states Healthline.
Lung conditions such as bronchitis and pneumonia can also cause chest pain on the left side if the left lung is affected. Bronchitis can develop after a viral infection. Pneumonia is an infection of the lung and symptoms include cough, chest pain, fever and shortness of breath. Lung cancer may also cause chest pain, says Healthline.