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There is a basic difference between SSPs and Entities. Entities contain of SSPs.

Entities have specific identity but SSPs may participate in different entities.

Both are natural, dynamic and have modalities.

Most of SSPs belong to only one specific entity, but there are some SSPs that belongs to two entities. Most of entities are not specific for miasms. They participate freely in many miasms

The Goal of of entity concept is to regularize and categorize SSPs. There etiologic causation of many SSPs are not understood yet. But there is more knowledge in entities. But the conditions are better in Entities. Most of their etiological relationships with miasms and diseases are known. This helps us speculate on the etiology of SSPs in a series of causal pathways. 


The big chalange is how to differentiate between SSps and Entities?

Here is an example.

Anosmia has two types. Peripheral and central. In both of them the patient have anosmia, but with two different causes. We could differentiate these two types by other SSPs. If Anosmia is accompanied with rhinitis, It belongs to Peripheral category but if there is CNS SSPs such as Memory deficits, it belongs to Central category.

In this example we have two entities with co-covering SSPs. As you see SSPs do not have specific identity but entities have. Anosmia should be categorized as SSP. Peripheral Anosmia should be considered equal to Rhinitis. Central Anosmia is always called  Anosmia.

Entities should have a known etiology. It means that you should know the pathology, which contain the specific tissue that cannot do its special function. If so, you could name it an entity.

Another example is retinitis and keratitis. Both have blurred vision. Retinitis also have visual field deficit and keratitis have eye pain and dryness. As you see blurred vision is a SSP which is common in these two entities. It has two different etiologies. It means that it dose not have a specific etiology, so it is not an entity. Interestingly another entity named Uveitis has also Blurred vision in its SSP list, and confirm our Claim that, Blurred vision is not an entity.