You are given a passage. Using the information present in the passage, you need to classify it into one of the 10 topics: 0 - 'Society & Culture', 1 - 'Science & Mathematics', 2 - 'Health', 3 - 'Education & Reference', 4 - 'Computers & Internet', 5 - 'Sports', 6 - 'Business & Finance', 7 - 'Entertainment & Music', 8 - 'Family & Relationships', 9 - 'Politics & Government'.

Looks like for the first 72 hours after an back injury or strain, you should use ice to reduce inflammation and pain. After that, heat can be applied or used alternately with ice. If you apply heat too early you could worsen the inflammation. Link from webMD below:
2