Misasa Hot Spring is one of the most famous radioactiye hot springs in Japan. A general survey of the spa treatment at Misasa Spa was carried out in Feburary, 1957. The informations we have gathered may be summarized as follows: 1). The number of the spa visitors seeking for curative treatment was almost equally divided between men and women and the majority of the spa visitors was over 50 years old. 2). 65% of the spa visitors came to this hot spring with the specific purpose of balneotherapy. 19.3% came for rest, 13.3% for the purpose of after-care. 3). Those who visited Misasa Spa for the first time were 44.7%, the rest being those who visited this spa over 2 times. 18.3% of them had consultation with or were under the direction of a physician. 4). The length of time they stay at this spa for curative treatment: 41.6% of the spa visitors stay for 8～14 days, 17.9% of them 15～20 days and 31% of them over three weeks. 5). About 74% of the spa visitors bathe 3 to 5 times a day for curative treatment, and 82% of them drink hot spring water. 6). Symptoms of bathing reaction such as generalised fatigue, constipation, loss of
appetite, joint pain, abdominal pain and so on were observed in 50% of the spa visitors.