Pica. Some causes are; iron deficiency, obsessive compulsive disorder, psychoses, or cultural practice in some tribes.
Anemia, other. People who compulsively eat substances that are not meant to be food may have iron deficiency anemia. Examples include ice and dirt. This can go along with a sense of tiredness, shortness of breath with exertion, and pale skin.
Pica? Is appetite for non - nutritive food, causes unknown.