The pain in the left side of the rib cage in the middle of pregnancy: 1. It may be caused by the increase in the size of the uterus and the pressure on the abdominal organs, so you need to go to the obstetrics and gynecology department of the hospital in time to find the cause of the pain, and then, according to the results of the examination, choose a reasonable treatment, and eat a light diet, do not eat cold, stimulating food. 2. It may also be caused by gastritis or other diseases. 3. It is because of intercostal neuralgia. It is recommended to have a light diet, take vitamin complex and avoid spicy and stimulating food. Apply hot compresses to the painful area, pay attention to rest and avoid getting cold. If it does not improve within a short period of time, you must go to a regular hospital in a timely manner and choose a reasonable treatment method after perfecting the relevant examination, do not miss the diagnosis, do not misdiagnose and do not delay the condition.