She was later started on Os-Cal as a calcium supplement, and within two weeks the symptoms recurred, again clearing with the cessation of the calcium intake. Some people may be very sensitive to calcium supplements. Females exposed to caged birds and dogs showed higher incidences of multiple sclerosis. X-ray examination was noted to be more frequent in multiple sclerosis patients than in controls. Prostate cancer risk is high in men who have sexual intercourse at a young age.
Smoking also increases the risk of prostate cancer.
The use of hair dye may increase the risk of lymphoma and leukemia. Cosmetologists, hairdressers and beauticians have been observed to have higher incidences of some malignancies, but women who have their hair dyed may also suffer higher incidences of some cancers. In the years from 1975 to 1987 eleven deaths were attributed to Salmonella poisoning, and more than 77 percent of these cases were traced to contaminated eggs. These eggs often had been certified as Grade A on inspection. Twenty-six patients were exposed to light for five days a week for three weeks, and reported significant improvement in fatigue, joint tenderness, joint swelling, morning stiffness, and grip strength.