This example is a very simplistic illustration. Homeopathic aggravations are usually much more complicated and complex. But, they are a good sign, as far as a cure being imminent. A modality aggravation is not a symptom, but, rather, an individual qualification. Modality aggravations describe modifications of a symptom, or the whole patient, towards a worsening of their condition.
Homeopaths use modality aggravations to influence the best choice between several remedies.
For example, even though several remedies may be strongly indicated in your case, a modality aggravation specific to a certain remedy may point your homeopath in that direction. Modalities are divided into several classifications. Miscellaneous is the category into which we place modalities that otherwise defy description in the other categories. Modalities of temperature, climate and weather are probably the most important ones in choosing the correct remedy. If your symptoms are worse between 4 p.m. to 8 p.m., Lycopodium is a good remedy for consideration.