Dehydration, lack of food and because you have to stand for hours + close crowd with lack of oxygen that makes some feel claustrophobic and like they can't breathe. Sometimes it’s not because you just feel claustrophobic it’s really because you can’t get air since thousands of people are pushing & screaming and jumping on you. Then there are those who get tooooo excited = BOOM they are down for the count. :doh: They anticipate the thrill of finally seeing him and when they do they are so overwhelmed and are overcome by it. 
I have been at his HIStory concert so I can say the crowd is the main reason.
Yes, this is absolutely right
I was to the only concert he did in my country it was a real adventure. I went on my own and I had just turned 18. Back on those days (1993) there were none of these incredible expensive "Golden", "Silver", "whatever-seats" they sell now. So if you wanted to be close to the stage, you had to arrive as early as possible and be fast to run to the stage as soon as the doors would open.
I arrived by 9:45... in the morning... and the show was scheduled to 21:00.... so you can imagine how long I had to wait. But there were people who arrived even earlier. It was Spring in Chile and the heat was at its highest. I am rather small and quite thin, so there I was: on my own, among thousands of people, no food, no water, no toiletts (!!!!!), under the burning sun of Spring. FOR HOURS!!!! And that was just to get into the stadium.
Finally the doors were opened by 14:00 and I almost get crushed by people, but eventually I managed to be first again and once inside the place, I ran like crazy and it worked!!! I got my place on first row. I was not right under the center of the stage, but to the left, but still first line, with the crowd barrier against my chest aaaaallll day long. But that was by far the best place to be, not only for it was first row, but also because you coul actually breath and if you needed help, it was right there. And being as small and thin as I am, being among the thousands in the crowd would have been simply impossible.
However, that was 50% of the job. Once inside, you really had to fight to keep your place, for people will try hard and without mercy to push you out. There were fights every now and then, but not that big. By the 2nd hour inside, we were really bored... and there were still some other 5-6 hours before the show.
There were many times I really felt like I would die right there, smashed as a potato among the wild crowd. Security was really worried about me and I remember this guard who kept my hand held and from time to time would come to me and ask... "Are you ok? Do you really want to stay here? I can take you out this easy and you can always come back..." But I knew once out, you wer out forever. So I would say no... and will keep my place. There was also a very nice guy by my side and he would tell me "Hold on!!! He is gonna be right there, right in front of us!! Hold on, hold on!!"
Thanks God I did hold on. Many didn't and there were some 100+ who fainted. Some others just asked to be taken away, since they couldn't be there anymore. The heat, the emotion, it was all a real battle.
When the sun finally went donw, things got better, but then the show was closer and people would do anything to get closer to the stage, so you had to keep your "fight"
Then.... Carmina Burana started playing and we knew our dream was finally beginning to come true. The rush of emotions, the thrill and the exciment you felt just to listen to those first sounds... I have no words to describe. In fact, just by typing this I am trembling once again.
Finally MJ jumped into the stage and the dream began. And if you think that you had been tight among people, things got worst but we all, all of us, all of a sudden were up, happy, excited, crazy. Just think of it!! All day long there, under the sun, no food, no water, alone (in my case), smashed and tired, but as soon as the teaser was on the big screens, we were all bright new, ready to rock.
And we did!!!! Michael's presence on stage is amazing, electrifying, unbelivable. You can't resist him. You can't fight him. If he would have told us to stand on one leng and touch our right ear with our left hand, we would have done so inmediatly.
He is so incredible, so sweet, so brilliant, so lovely, so GREAT!!! I have never felt that before/after that show. He had us on the palm of his hand. All the time!!! The best show ever. That is why I am so sorry for the ones fainting. They did miss the most incredible show in our country.
A once in a lifetime opportunity for us.
And so it was for me. There I was, out of my mind, screaming, jumping and even dancing! I don't know how, but we did manage to dance to the rythm. It was impossible to fight the sound, the emotions, you just HAD to follow Michael.
But after all that time waiting for him, I wanted a bit more. We were really close to the stage, some 2 meters or less and as he would come to us, we will scream louder and louder. He didn't use earphones, you know, so he could actually listen to us and he did! So eventually, when he came to our side, he stood just in front of me and it seemed to me like he was singing and reaching to me.
I was in shock. The security people started looking at me and to Mike and they also noticed he was there for me. I couldn't believe it so instinctively I pointed to myself like asking "
Is it me who you are singing for?" And then the most unexpected thing ever happened.
Michael kept singing while approving with his head and then it was like he said "
Yes, it's you", he pointed to me and slowly took his right hand to his lips and blew a kiss to me.
I was paralized. It was so shocking I simply got frozen and could speak, couldn't sing, couldn't move and couldn't hear anything. I just have this precious moment in my head, all the images clear as crystal, slow motion, but no single sound. No sound!! So I don't know which song he was singing!!!!!!
I felt like my heart would stop and he kept there, singing and pointing to me. By that time, people around and in front of me, especially security, were all amazed. "Yes, girl, it is you, it's you!! He is singing to you!!! Tell him something, tell him something!!!", said one of the security crew. Fans by my side and behind me started hitting and tapping my head, my arms, my shoulders and some of them were even agry and asked "What did you say to him??" and then urged me to answer to him. Finally I managed to scream even louder, the highest "
I LOVE YOU MICHAEL!!!" you could imagine, while blowing him a million kisses. He was smiling again and people kept asking what I had said to him, how I did it and if I had ever met him before, so he will take so much care of me. But I didn't!!
Finally the dream had to end. He kept smiling and singing, waved goodbye and went to the center of stage.
And there I was.... still on my cloud. Still dreaming of his smile, of his sweet kiss and unable to believe he had chosen ME amongst all those people.
A dream. For some minutes in time, it was all about Michael and me. My one and only MJ Golden moment. Of course, this is like nothing in comparison to those great stories we all know, but for me, living in the last country of the world, all alone there, among so many people, being Michael so out of my reach... for me, it is a treasure I will always keep in my heart. Our moment in time
And yes, I was not chosen by third-parties to go on stage... but I was chosen by Michael Jackson HIMSELF to be given the sweets moment in my life
hahahahahaah!!! LOL!!!
Ok... I am sorry... this was completely out of topic but I just let my emotions run free. I just felt I needed to share the experience
