Common CausesĀ 
Idiopathic
Infantile Colic
Corneal Abrasion or Eye Foreign Body
Hair Tourniquet: around finger, toe, penis

Infections
Viral illness,
Otitis media,
Pharyngitis
Pneumonitis
Urinary tract infection,
Acute Gastroenteritis
Herpes stomatitis,
Meningitis,
Osteomyelitis,
Septic joint,
Thrush

Gastrointestinal Causes
Infantile Colic
Constipation
Cow’s Milk Protein Intolerance (peaks at 13 weeks)
Pediatric GERD
Lactose Intolerance
Intussusception (especially over age 3 months)
Intestinal Malrotation and Midgut Volvulus
Incarcerated Hernia
Anal fissure

Trauma, etc.
Corneal Abrasion or Eye Foreign Body
Hair Tourniquet: around finger, toe, penis
Fracture
Trauma (e.g. Fracture, Subdural Hematoma)
Consider Child Abuse (non-accidental Trauma)
Testicular Torsion (especially if Undescended Testicle)
Drug Ingestion
Neonatal abstinence syndrome (maternal drug use)
Immunization reaction

 

 

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