What exactly is a real Vampire?

So what exactly is a Sanguinarian Vampire?
'''Sanguinarian Vampires are your classic blood feeding Vampires. They need to consume human or Animal blood in order to remain healthy. The causes of Sanguinarian Vampirism can be attributed to very few physical conditions, although it is generally accepted there are many forms of Sanguinarian Vampirism with different causes.'''

'''Vampiric forms of Porphyria are caused by problem with the body’s ability to produce haem, a vital component of haemoglobin. It is beleived by many scientists that Porphyria may have been the disease that started popular Vampire Folkelore. Not only do Porphyria sufferers crave blood, but they blister and burn in sunlight, and are extremely intolorent to allicin (found in garlic). In some cases gums can recede, which can make the teeth look larger and fang like. This is the result excessive amounts of specific hormones in the body.'''

'''It is believed by many, that vampirism can have physical or non-physical causes, and sometimes a bit of both. Very little is known about any form of vampirism, even the ones the scientists do know about. Typically vampires that do not feed become violently unwell the more deficient their body becomes. The subject will become physically weak, discoloured, suffer with symptoms of mental illness due to impaired brain function and experience animalistic and predatory urges. Some cases can result in hospitalisation if malnourishment continues.'''

Typically a vampire will suffer from few health problems if they have a stable supply of blood, while those who do not may experience constant health issues.

'''Sanguinarian Vampires need blood as regular humans need food. Lack of feeding results in a poor quality of life and crippling illness. This of course depends on the cause of their need for blood and how promenant it is. Typical symptoms caused by lack of feeding include, but are not limited to:'''

'''Insomnia Lethargy Abdominal Cramps Inability to Digest Food Neurological Depression Neuropathic Pains Tremors Cravings for Blood or Blood Related Products Hypersensitivity Paler Skin Dark Circles under the eyes'''

'''Some symptoms of Sanguinarian Vampirism are permenant and never relieve such as sensitivity to sunlight, allicin and visual sensitivity to bright light as well as hypersensitivity. This can include all 5 senses.'''