Lying on the left side and having pain in the right side of the ribs may be a bad symptom caused by costochondritis, or it may be discomfort caused by diseases such as costochondritis, herpes zoster, trauma and so on. 1. Costal chondritis: when suffering from costal chondritis, it may cause the symptom of lying on the left side of the right side of the rib pain, this kind of disease will lead to localized pressure pain, when the side is squeezed by the local pain will make the pain symptom is more obvious, the pain is radiating, the back may also be uncomfortable, and some of the patients will have localized skin redness and swelling. 2. Costal Fasciitis: Costal Fasciitis can also cause this kind of discomfort, accompanied by soreness, muscle stiffness and other undesirable symptoms, the pain symptoms will be more obvious when carrying out large-scale movements, the pain will be more intense after overexertion. 3. Herpes zoster: lying on the left side of the right side of the rib cage pain, may also be caused by herpes zoster intercostal neuralgia, usually paroxysmal pinprick pain, the skin surface will appear in varying degrees of herpes or blisters, there may be pain, tingling and other adverse symptoms. 4. Trauma: lying to the left side of the right side of the rib pain, may also be the discomfort caused by trauma, by external injuries or strong impact, the local skin or ribs will appear damage or fracture, etc., there will be obvious pain. Lying to the left side of the right side of the rib pain there are many other reasons, such as gallstones, pneumonia, tumors and so on, you need to consult a doctor in time for examination, under the guidance of the doctor’s advice, and actively cooperate with the treatment, to avoid aggravation of the condition.