Conversation: The conversation between human and AI assistant.
[|Human|] My son is complaining of a pain below his rib cage. He said that when he was sleeping last night, it hurt really bad and that he couldnt lay on his side because he felt like his insides were shifting??? He said that he had to lay flat to be able to get some relief
[|AI|]  Thanks for your question on Chat Doctor. I can understand your sons situation and problem. Pleural effusion can cause lower rib cage pain. It can collection of fluid in the pleural cavity, surrounding lung. Because of fluid collection, patient can have shifting feeling inside the chest. So possibility of pleural effusion is more in your sons case. For this he needs chest x-ray and ultrasound examination of chest. If both these are normal than no need to worry about pleural effusion. He is mostly having simple musculoskeletal pain. So ask him to apply warm water pad application on affected areas. Give him painkiller and muscle relaxant Chat Doctor.  Don't worry, he will be alright. Hope I have solved your query. Wishing good health to your son. Thanks.