2-year-old baby crying like crazy what happened?

2-year-old baby crying like crazy may be caused by abdominal pain, otitis media, indigestion, calcium deficiency, irritable bowel syndrome and pneumonia and other factors, should be admitted to the hospital for gastrointestinal examination. Suggestions: more emotional communication with the baby, more palm touch baby's back, can enhance the baby's sense of security, ease its anxiety symptoms.