Neurofibromatosis type 1 is an autosomal dominant disease caused by mutations of the neurofibromin gene (NF1). Its clinical manifestations include neurofibroma tumors, typically on the skin. This article aimed to report three NF1 cases with different characteristics on symptoms, pedigree, mutation analysis, and genetic counseling. Our method included the investigation of pedigree, historical medical record and clinical examination. NF1 mutations were tested by next generation sequencing and/or Sanger sequencing. Phenotypes of NF1 patients were extremely variable, with or without a positive family history of the disease. Genotypes of these cases were unique but all leading to stop gained. Genetic counseling provided information on the progression and possible complications of this disorder, current treatment therapies, mode of inheritance, origins of mutations, the risk of inheriting a mutation to offspring. Molecular genetic testing for the identification of a pathogenic variant is essential for early diagnosis, prenatal or preimplantation genetic testing.