Hi Thank you for your question to HCM. From what you have described and if there is no other obvious inciting event your pain is likely coming from prolonged sitting. The solution for this would be muscle relaxing exercises and stretching. You will need to learn these from a physiotherapist and once you understand them you can keep doing them on your own. It is understood that your time is important as you are studying for medical PG entrance exam however doing these exercises thrice everyday will keep the pain under control. Also you can take a tablet consisting combination of analgesic like diclofenac or aceclofenac and muscle relaxant like chlorzoxazone on full stomach if and when pain interferes with your studies. Hope this is helpful. Wish you the best for exams.