How Concerned Should You Be If Someone Passes Out When

How concerned should you be if someone passes out when they get a muscle spasm feeling of pain in their stomach, this is someone who has passed out when removing a bandage from a large cut he got - 11 hours earlier on his hand. this time he felt a pain like muscle spasm in his stomach- upper left abdomen area, thought about it being appendicitis and then did not feel good and passed out. Came to within minutes because he was shaken by the person with him asking if he was all right. No further spasms or other symptoms have occurred since this was about 5-6 hrs ago.