The left side of the lower ribs pain can consider the costochondritis, gastrointestinal diseases, herpes zoster, heart disease, trauma and other causes related. 1. Costal chondritis: for example, when long-term bending work and the affected area is stimulated by cold for a long period of time, it can cause aseptic inflammation localized below the left side of the rib cage due to strain, resulting in costal chondritis and obvious pain symptoms below the left side of the rib cage. 2. Gastrointestinal diseases: since the fundus of the stomach and the upper part of the gastric body are located in the lower part of the left side of the ribcage, when chronic gastritis, gastric ulcer, tumors and other diseases occur here, it can lead to pain in the lower part of the left side of the ribcage; or when enteritis occurs, in addition to the symptoms of the digestive tract, it will also appear in the left side of the ribcage below the pain in the deep part of the left side of the ribcage. 3. Herpes zoster: when herpes zoster occurs, in addition to skin blisters, it will also lead to pain in the nerve distribution area below the rib cage. At this time, it is recommended to go to the hospital dermatology department for targeted treatment. 4. Heart disease: such as acute myocardial ischemia, myocardial infarction and other diseases, can make the left side of the ribcage below the pressure pain symptoms. 5. Trauma: when the left side of the ribs or soft tissue injury due to external violence, also appear left-sided pain below the ribs. When the pain under the left side of the rib cage continues to be unrelieved, it is recommended to go to the hospital as soon as possible, to clarify the cause of the disease, to avoid delaying the condition.