The way sickness was viewed in Biblical Old Testament times and the way sickness is viewed today in the 21st century is almost in completely opposite terms. In Old Testament times, sickness was primarily viewed as a judgment from God for sins. This view primarily stemmed from Israel’s experience in the Exodus from Egypt, when God inflicted plagues on the Egyptians.
In our modern day post-Darwin era, sickness is almost always viewed as strictly a result of natural causes, with no thought given to spiritual issues such as sin. Medicines and other cures are seen as the remedy for all sicknesses. If a cure does not exist in medicine, it is believed that one will be discovered in the future through scientific research.
Both of these views are extreme and imbalanced. Read how King David, the most righteous king that ruled Israel in Old Testament times but nevertheless suffered from sickness, dealt with his illness, and how he was healed and restored. The principles he teaches for restoration from sickness still work today!