What could cause chest pain on the left side when breathing?

When you feel pain on the left side of your chest while breathing, one common reason could be pleurisy. Pleurisy is when the thin covering around your lungs becomes inflamed, making each breath hurt. This inflammation can result from an infection, injury, or another lung condition. Sometimes, pain that seems to come from your chest when you breathe might also be due to problems with your heart, like a heart attack, though heart pain is usually less linked to breathing itself and more constant. In addition, muscle strain from an injury or overuse and rib injuries can cause pain when you breathe deeply because the muscles and bones move with each breath. These conditions can make the chest feel sore, tight, or sharp when you take a deep breath or cough. It is important to talk with your doctor about any chest pain, especially if it is new, worsening, or comes with other symptoms like trouble breathing. To help identify what might be causing your symptoms, you can try our free AI symptom checker before your appointment to ensure you receive the proper assessment and care.