Hi, There are many potential causes of right-side pain, including problems with the gastrointestinal system, reproductive system, urinary system, or musculoskeletal system. Some possible causes could be related to kidney stones, ovarian cysts, appendicitis, or muscle strain. It s important to note that drinking a lot of water can sometimes exacerbate certain conditions, such as kidney stones. Additionally, while one Coke-A-Cola is unlikely to cause any significant health issues, consuming sugary drinks regularly can contribute to obesity and other health problems. Again, I strongly recommend seeking medical attention from a healthcare professional who can provide a proper diagnosis and treatment plan. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Diwashish Biswas, Internal Medicine Specialist