Equine colic tends to be abdominal.
The intestinal tract goes into spasm causing a great deal of pain.
The horse may roll or groan, lie down or pace about.
All horses are different and so all equine colic is different.
There is no one solution.
But there are generally only three causes:

1. eating too much grain, for example, getting into the feed bin
2. sand colic, where there is a lot of sand in the digestive tract
3. stress

All three causes need to be treated differently.
And the horse will exhibit their own unique and personal symptoms.
The first cause is best dealt with by the use of homeopathic medicine.
The second is best prevented by a daily dose of psyllium husk in the diet.
The third cause is probably the most common and the most disturbing equine colic.
It seems to appear for no reason.
Few people really take into consideration the stress horses are under.
Being a prey animal, they are very easily frightened.
They have evolved to be on alert all the time, otherwise they may be eaten.
This applies as much in today's domestic horses as it does in wild horses.
I once recall a veterinarian commenting on the fact that horses tend to colic more at the weekends, than during the week.
He put it down to the fact that it's only at weekends that people see their horses colic.
He assumed that they suffered just as much during the week, but dealt with it themselves.
I disagree.
Most horses are worked or shown more at the weekends, putting them under much more stress.
So the first thing to do is to recognize that a horse gets frightened very easily.
And doesn't recover from the fear quickly.
Punishing them or causing pain by rough treatment will only exacerbate the problem.
The homeopathic medicine Aconite may go a long way to settle the fear.
This, in turn, is likely to calm the colic.