Pneumonia
Asthma
Pulmonary hypertension
Vaso-occlusive pain crisis
Bony infarction
Dactylitis
Avascular necrosis of femoral head<unk> 
Asthma
Pulmonary hypertension
Gallbladder disease
Acute hepatic sequestration
Infection
Meningitis
Pneumonia
Septic joint
Osteomyelitis
Parvovirus B19
Splenic sequestration
CVA
Cerebral aneurysm and ICH
Priapism
Papillary necrosis
Meningitis
Pneumonia
Septic joint
Osteomyelitis
Acute chest syndrome
Pneumonia
Acute coronary syndrome 
Asthma
Flail chest
Pulmonary hypertension
Fat embolism syndrome
Vaso-occlusive pain crisis