Chest pain on the left is pain sensations of a compressive, stabbing, pressing nature, which are localized in the left half of the chest. Most often, the symptom is caused by coronary and non-coronary heart diseases, pain is observed with inflammation of the left lung and pleura, collagenosis, and gastrointestinal pathology. To establish the cause of the pain syndrome, an ECG, ultrasound of the heart, chest x-ray, clinical and bacteriological studies are performed, and invasive diagnostic methods are used. Nitroglycerin and NSAIDs are used to relieve pain, etiotropic drugs are selected after the underlying disease is identified.