<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello: When I retruned from the gym after lifting light weights 20-30 pounds, I bent over to recover a pencil on the floor and had to lay completly flat on my stomach. When I did I felt a pop in my lower right rib cage area- that was 2 days agao. Today it feels much worse w a fair amount of pain. Its difficult to lay on my right side. Any idea what it is? How severe it might be?  <response>: Hi... Your lower rib cage pain is due to straining your oblique muscles... Nothing to worry . I suggest you to keep icing your painfully area frequently say for 15 mins for every 2 hours...Dont do activities forcefully as everyone you do youre increasing the spasm... So take it easy keep you back supported while sitting with a pillow placed in the low back... As pain permits slowly rotate towards the opposite side to stretch that muscle a bit...dont be in a hurry to overstretch it...in sitting position gently bend sideways and take deep breath in and breathoutHope this is helpful for you.Revert in case you need further clarification 