Left side rib epidermis jumped pain without redness and swelling, may be related to trauma, intercostal neuralgia, lung disease, heart disease and other conditions. 1. Trauma: if the patient’s left rib area is squeezed by other things or collision, it will make the area damaged and throbbing pain, if the injury is not serious, it may not be accompanied by redness and swelling symptoms. 2. Intercostal neuralgia: if the patient’s epidermal throbbing occurs after overexertion and there is no pain under normal circumstances, intercostal neuralgia should be considered. 3. Lung disease: If the patient has lung infection, pneumothorax and other lung lesions, it can also lead to throbbing sensation on the left side of the rib cage. 4. Heart disease: If the patient has a series of heart diseases such as myocardial infarction, angina pectoris, etc., due to the stimulation of the disease, it will spread to the surrounding tissues and cause the symptom of local throbbing pain. It is recommended that the patient should seek medical examination in time, and if necessary, the disease can be determined by electrocardiogram and ultrasound examination.