An abnormal increase of bone mineral density, that is, of the amount of matter per cubic centimeter of bones which is often referred to as osteosclerosis. Osteosclerosis can be detected on radiological examination as an increased whiteness (density) of affected bones. The phenotype is HP_0011001 (Increased bone mineral density). Also known as: Increased bone density, Osteosclerosis, Osteosclerosis of bones.