Neuroblastoma is a cancerous tumor that affects children and infants and can cause several symptoms. Common symptoms of neuroblastoma include abdominal pain, loss of appetite, weight loss, bone pain, fatigue, fever, paleness, and dark circles under the eyes. Additionally, some patients may experience nausea, vomiting, rapid breathing, a lump or mass in the abdomen, and difficulty walking. If left untreated, neuroblastoma can spread to other organs in the body, resulting in more severe symptoms, such as difficulty breathing, paralysis, and seizures.