Thalassemia minor is an asymptomatic condition in which a person is a carrier of the thalassemia trait, as stated by Healthline. Thalassemia is a hereditary blood disorder that causes the body to make abnormal hemoglobin that destroys the red blood cells and leads to anemia.
Thalassemia minor occurs when a person inherits the thalassemia trait from one of his parents, as stated by WebMD. A person who has thalassemia minor has no symptoms, and he does not need any treatment. However, the person can pass the defective thalassemia gene to his child, according to Mayo Clinic. If both parents have thalassemia minor, there is a 25 percent chance that their child may have thalassemia major, which is a serious form of the disease, as stated by Healthline.