Prolapsed Grade III Hemroids 

Bouts of diarrhea
Diarrhea is the body's way of getting rid of bacteria from its digestive system. It is commonly caused by contaminated food. However, diarrhea can also be caused by an allergic reaction to food and milk, by stress and anxiety, as well as by an adverse reaction to medication and laxatives. 

In the case of diarrhea, the expulsive force of the watery stool can damage rectal veins and lead to hemroids. 

Constipation 
Paradoxically, the opposite of diarrhea can also lead to hemroids! Constipation is defined as infrequent bowel movements or the difficulty in passing stool. The longer the stool remains in the colon, the drier it gets. After a certain point, usually a fair amount of straining is required to pass the dry and hard stool.

A common condition in the elderly, constipation is one of the major causes of hemroids in this segment of the population.

Extreme physical exertion
Laborers and weightlifters often hold their breath or grunt while lifting heavy objects. This forces air downward in the lungs and exerts pressure on the diaphragm, which in turn exerts pressure on the abdominal organs and rectal veins.

Note that weightlifters can also get hemroids because they eat a lot of animal proteins in order to gain bulk and mass.

Prolonged sitting or standing and lack of exercise
Sedentary lifestyle, lack of exercise, as well as jobs which require prolonged periods of sitting and standing can lead to, or exacerbate, existing hemroids.