It is normal to have 1-2 bowel movements per day. When there is an increase in the number of bowel movements, it may be diarrhea, and when there is a decrease in the number of bowel movements, it may be constipation. Diarrhea and constipation are defined not only by the change in the number of bowel movements, but also by the nature of the stool. Diarrhea is defined as an increase in the number of bowel movements, with more than three bowel movements per day, and thin stools with increased water content. The increase in the number of bowel movements and the change in bowel habits can only be called diarrhea when the water content is generally above 80% and the stool may contain pus or undigested food. Constipation is also defined as a decrease in the number of bowel movements, with less than three bowel movements per week, as well as difficulty in passing stools and dry stools. Diarrhea or constipation is mostly related to dietary factors and is often associated with numerous digestive tract diseases.