Hello You are having right side cramp in lower part ( pain is severe as you can t move or pick up anything ), this pain may be due to these possibilities , these include. 1Appendicular lump ( mild swelling in the right quadrant lower part) or appendicitis . Diagnosis can be confirmed by ultrasound scan and physical examination by a surgeon ( also by a physician ). 2 If pain is referring in the back then this may be due to right renal calculus( however, stone may be anywhere in urinary tract system ). Diagnosis can be confirmed by ultrasound of kidney and also urine examination. 3 Right side ovarian cyst or salpingitis ( if patient is female ) . Again diagnosis can be confirmed by ultrasound of this part. However , there are so many other causes of such pain as sub acute intestinal obstruction , but you didn t mention any symptom except pain and cramp so it is very difficult to establish any diagnosis merely on the basis of this information. I recommend you please deal as mentioned above . Good luck.