Diarrhea, also spelled diarrhoea, is the condition of having at least three loose or liquid bowel movements each day. It often lasts for a few days and can result in dehydration due to fluid loss. Signs of dehydration often begin with loss of the normal stretchiness of the skin and irritable behaviour. This can progress to decreased urination, loss of skin color, a fast heart rate, and a decrease in responsiveness as it becomes more severe. Loose but non-watery stools in babies who are breastfed, however, may be normal. 

The most common cause is an infection of the intestines due to either a virus, bacteria, or parasite; a condition known as gastroenteritis. These infections are often acquired from food or water that has been contaminated by stool, or directly from another person who is infected. It may be divided into three types: short duration watery diarrhea, short duration bloody diarrhea, and if it lasts for more than two weeks, persistent diarrhea. The short duration watery diarrhea may be due to an infection by cholera, although this is rare in the developed world. If blood is present it is also known as dysentery. A number of non-infectious causes may also result in diarrhea, including hyperthyroidism, lactose intolerance, inflammatory bowel disease, a number of medications, and irritable bowel syndrome. In most cases, stool cultures are not required to confirm the exact cause.
can blood be in diarrhea?
was is it called when there is blood present?
Can many things cause it?
does diarrhea have an alternative spelling?
what is the alternative spelling?
can babies have diarrhea?
how many duration diarrhea types are there?
is it always caused by infection?
how can causes be found out?
what babies may have normal loose stool?
what is a sign of dehydration?
can the heart rate increase?
what is it called if it lasts 3 weeks?
what non infectious causes are listed?
yes
If blood is present it is also known as dysentery
dysentery
If blood is present it is also known as dysentery
yes
may also result in diarrhea,
yes
Diarrhea, also spelled diarrhoea
diarrhoea
Diarrhea, also spelled diarrhoea
yes
Loose but non-watery stools in babies who are breastfed, however, may be normal. 
three types
It may be divided into three types
no
A number of non-infectious causes may also result in diarrhea
stool cultures
stool cultures are not required to confirm the exact cause.
babies who are breastfed
babies who are breastfed, however, may be normal. 

loss of the normal stretchiness of the skin
Signs of dehydration often begin with loss of the normal stretchiness of the skin
yes
a fast heart rate
persistent diarrhea
if it lasts for more than two weeks, persistent diarrhea
hyperthyroidism, lactose intolerance, inflammatory bowel disease, a number of medications, and irritable bowel syndrome
 non-infectious causes may also result in diarrhea, including hyperthyroidism, lactose intolerance, inflammatory bowel disease, a number of medications, and irritable bowel syndrome