Im sorry to hear about your son. There are a number of conditions which can poresent as lower left abdominal pain, in children this can be due to a problem with the kidneys. This would be true if there are additional symptoms like burning, urination, dark colored urine or even blood in the urine as well as increased frequency. This occurs due to a UTI or even due to a kidney stone, in children stones can occur because of a problem with the calcium metabolism. Simple urine tests and blood tests can diagnose the problem.
Another cause of this could be associated with an intestinal infection, especially if he also has diarrhea and/or vomiting. This can be bacterial or viral in nature. In viral infections, only supportive case is needed in the form of rehydration therapy whereas in bacterial infections antibiotics are used.
ANother thing which can cause pain of this sort is meckels diverticulum which is an abnormal growth in the intestine which can become infected and inflammed, usually the pain would occur on the right side but sometimes it can occur on the left side as well. Now i would recommend that since he has severe pain in the region and if he has tenderness as well, that is an indication that you should take him to urgent care where they can run tests and also do a clinical examination to rule out all of the above.
Do you have any more questions? Im open to any questions regarding this matter or if you have additional information about this.
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