Dr. Hanif warmly Welcomes you! Thanks for consulting at my virtual clinic. I have carefully worked through your case, and I can realize your health worries. Being your physician, I assure you not to worry as I will take care all of your medical concerns. It may be due to Gastroesophageal Reflux Disease. For that you should raise the head end of the bed ( don t increase pillows, rather keep something under the head end of the bed). And give him Omeprazole40mg before meals 2 times a day. He should feel better in a week. Follow up with me after that time. I will suggest permanat cure. Also add his height, age, weight in follow-up question. It may also be due to muscular spasm ( less likely). Don t take any painkiller for that. Just apply Bengay ultra stretch gel on affected area. Avoid heavy, fatty, fried, spicy meals, fast foods, soda, coffee, tea, energy drinks etc etc. Take fruits and vegetables, milk at temperature near 37 degrees centigrade. Keep a good physical activity too. Hope I answered all of your health concerns . If you have further questions in future, feel free to contact me anytime. In the start of your question write my name, and I will get back to you in no time. If satisfied, please click you found it helpful. Have a wonderful time ahead. Best Regards! DR. MUHAMMAD M. HANIF USA