An aggravation is the temporary appearance of new disturbances in well being, or a temporary intensification of existing disturbances, following taking your homeopathic remedy.
Aggravations are harmless, usually mild, and short-lived. They sometimes occur following the first dose of a remedy as part of the initial re-balancing effect, or when the remedy has been taken more often than needed, or if the person is unusually sensitive to that particular remedy.
If person’s existing wellness disturbances intensify, it is called a similar aggravation and means the remedy selection is correct and improvement will follow – but don’t re-dose until improvement stalls or disturbances return. If the aggravation involves new and different wellness disturbances (while original problem remain unchanged), it is known as a dissimilar aggravation and indicates that the remedy choice is wrong and a new remedy needs to be selected.
Here is a link that describes how to deal with an aggravation: