During the nineteenth century, among the mine workers of the cases of lung cancer were detected in greater frequency than in the surrounding areas. It was later found out that these mines contained various radioactive substances which were the cause of cancer.
Experimentally also prolonged exposure of laboratory animals to X-ray or other radioactive substances has been shown to produce cancer. Many inexperienced technicians working with X-ray machines in the past were found to develop cancer of the skin over the hands and even developed leukemia commonly called ‘blood cancer’. Bone cancers were noted to have occurred more frequently in girls who were engaged in watch factories to paint dials of watches with luminous and other cancers have been shown to have occurred among many Japanese who were exposed to the atom bomb explosions.
Solar radiation has its share in the causation of cancer. In Australia , New Zealand and some parts of the United States
Cancer Formation by Chronic Tenderness
A slight but constant injury over a period of many years has been known to lead to cancer of that part of the body. A jagged edge of a broken teeth rubbing against the tongue, gallstones rubbing constantly against the gallbladder, the smoking short clay pipes have led to cancers of the tongue, gallbladder, and the lips respectively.
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