i actually made a small explanation right here of the symptoms
loss of breath. the neomorph when it's layed though the spores grows inside one of the lungs. when it gets too big to fit the lungs one of the lungs will collapse leading to the person not being able to breathe.
pale skin. in order for the neomorph to grow it most need blood cells. so in order to get the cells it absorbs the cells inside of the infected. since the neomorph is so big it takes half of the blood cells leading to pale skin.
loss of balance. since the infected dosen't have many blood cells due to the neomorph it dosen't have that many oxygen to the brain. remember how when you donated blood and you felt woozy. same goes to the victims too since they don't have alot of blood in there brain
vomiting up blood, when the neomorph gets too big in the back it crushes the kidney, resulting for the person to vomit up there own blood
If you get infected twice and you are big enought you can make alien twins?
Something that size growing anywhere in your chest cavity would put pressure on the lungs, causing great difficulty in breathing.
Loss of blood by any means leads to anaemia, for example, the embryo sapping blood from internal organs.
A crushed kidney would cause internal haemorrhaging but would not of itself cause blood to be vomited. My own two cents: by this time, the embryo is starting to burrow its way out, resulting in rupture and bleeding of the oesophagus.
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