Pain on both sides of the chest may be related to trauma, breast causes, lung diseases, thoracic spine compression and so on. 1. Trauma: If the chest is injured by impact and other injuries, swelling and congestion occur due to damage to soft tissues, or pneumothorax, etc., pain on both sides of the chest, accompanied by tightness in the chest, breathlessness and other symptoms may occur. 2. Breast causes: such as cystic hyperplasia of the breast, there will be obvious pain before menstruation, and most of them will improve after the cycle. 3. Lung diseases: such as bacterial pneumonia, when the bacteria invade the lung tissue, under the stimulation of inflammatory factors, pain on both sides of the chest, accompanied by fever, cough and other symptoms. 4. Thoracic spine compression: such as spinal stenosis, etc., can be manifested as pain on both sides of the chest with back discomfort. Pain on both sides of the chest can also be seen in other diseases, it is recommended that patients go to the hospital in time to avoid delaying the condition.