what are the different forms of it?
Macrocytic anemia, microcytic anemia , and sickle cell anemia.
Anemia
 Anemia can also be classified based on the size of the red blood cells and amount of hemoglobin in each cell. If the cells are small, it is called microcytic anemia; if they are large, it is called macrocytic anemia; and if they are normal sized, it is called normocytic anemia. 
what is apororhynchus? It a genus of small parasitic spiny-headed  worms. does it cause any disease? Yes, specially in birds. can you name any? Enteritis and anemia. where did it get the name from? The name  was chosen based on the characteristic absence of a proboscis in this species of Acanthocephala. what symptoms does the second disease show? Weakness or fatigue,  poor concentration, shortness of breath on exertion ,increase in  cardiac output.  palpitations, angina , intermittent claudication of the legs, and symptoms of heart failure. how can it be diagnosed? It is typically diagnosed on a complete blood count.
wiki:8281811
Anemia [SEP] Introduction
These recommendations may also apply to some people with acute bleeding. Erythropoiesis-stimulating medications are only recommended in those with severe anemia. Anemia is the most common blood disorder, affecting about a third of the global population. Iron-deficiency anemia affects nearly 1 billion people. In 2013, anemia due to iron deficiency resulted in about 183,000 deaths – down from 213,000 deaths in 1990. It is more common in women than men, during pregnancy, and in children and the elderly. Anemia increases costs of medical care and lowers a person's productivity through a decreased ability to work. The name is derived from "", meaning "lack of blood", from ἀν- "an-", "not" and αἷμα "haima", "blood".