The most usual place of occurrence for hemorrhoids is the anal region.
This can possibly be outside the anus or inside the rectum.
The hemorrhoids are differentiated and classified depending where they occur and depending what is stage of the condition.
When they occur inside the rectum, they are classified as internal hemorrhoids.
An internal one can progress to a more advanced condition more commonly called as prolapsed.
This happens when the hemorrhoids inside the rectum are pushed out of the anal opening during bowel movement.
The degree of the prolapsed hemorrhoids depends on whether they can go back in the rectum on their own or can be manually pushed back inside or the worst case is when they cannot be pushed back inside.
On the other hand, when they form at the opening of the anus, they are classified as external hemorrhoids.
These are prone to thrombosis.
This happens when the veins rupture or when a blood clot is formed.
These are then classified as what we commonly call thrombosed.
This type is the most painful one among all the different classifications.
They are painful because of the blood clot that is formed.
This blood clot eventually reduces the blood flow from the external hemorrhoid to the surrounding tissues.
It also prevents the helpful toxins to be transmitted through the veins.
Instead, these toxins are being seeped into the area which the thrombosed is located and the areas surrounding it causing a huge inflammation, thus resulting to a lot of pain.