Possible causes of chest pain in men include muscle strain, pneumothorax, hypertrophic cardiomyopathy, pericarditis, lung infection, pleurisy, and heart attack. 1. Muscle strain: Inflammation of the muscles and tendons around the ribs can cause persistent chest pain. If the pain worsens with activity, it may be a symptom of muscle strain. 2. Pneumothorax: Sudden chest pain occurs when outside air enters the pleural cavity and builds up. It is accompanied by shortness of breath, fatigue and rapid heartbeat. It is easily seen in tall, thin men. 3. Hypertrophic cardiomyopathy: The thickening of the patient’s heart prevents blood from flowing out of the heart normally, causing the muscles to work very hard to pump blood, and symptoms such as chest pain, shortness of breath, dizziness, lightheadedness and fainting may occur. 4. Pericarditis: This condition is an inflammation of the sac cavity around the heart and can lead to severe chest pain that can be exacerbated by breathing or lying down. 5. Lung infections: such as pneumonia can cause severe or stabbing chest pain that can be accompanied by other symptoms such as fever and coughing up sputum. 6. Pleurisy: Pleurisy is an inflammation of the membrane covering the lungs, which can lead to severe chest pain when breathing deeply. 7. Heart attack: Chest pain is one of the main symptoms and can also lead to neck or back pain, dizziness or weakness, shortness of breath and other symptoms. There are more causes of chest pain in men, and it is recommended that patients seek medical attention in time to clarify the diagnosis and treat the symptoms.