Passage: Twenty-nine plaintiffs, consisting of 9 people with itai-itai disease and 20 of their family members, sued the Mitsui Mining and Smelting Co. in 1968 in the Toyama Prefectural court. In June 1971, the court found the Mitsui Mining and Smelting Co. guilty. Subsequently, the company appealed to the Nagoya District Court in Kanazawa, but the appeal was rejected in August 1972. The Mitsui Mining and Smelting Co. agreed to pay for the medical care of the people who had been affected, finance the monitoring of the water quality performed by the residents, and pay reparations to the people with the disease.People who believe that they have itai-itai disease have to contact the Japanese Ministry of Health, Labor, and Welfare to have their claims assessed. Many people with itai-itai disease were not satisfied with government actions and demanded a change in the official procedures. This caused the government to review the criteria for recognizing a patient legally; the government also reassessed the treatment of the disease.

Question: what diseases were many people suffering from?
itai-itai