Diseases
They make you sick.
Aminerrea
Auregh-Rosen Syndrome
Kayla and Meekie have this. Virulent but not often deadly.[1]
Balanatus
Beritt's Disease
Simone Foster, the Karak'An ballet dancer has this.
Buliat
Cancer
Amaranth and Persey have various cancers. Cancer has become "more pernicious in humans since they've become spacefarers, and no one's sure why."[1]
Cerrmoniah
Kuriel has this. A disease that consumes the nerve endings as fast as they're rebuilt.[1]
Kerriwiht's Disease
Genetic disease, though blood of a carrier can infect others with the non-genetic strain of the disease. This is the one Kellen Grove has. [2]
Little Finger Disorder
A degenerative disease that attacks the nerves; onset usually involves the nerves leading to the pinkies and smallest toes, thus the name. Also known as "Small Finger Syndrome"; Human doctors nicknamed it "Pinky."
Mediger Syndrome
What happens to lighter gravity species when they try to live on heavier worlds. This is usually addressed with acclimatization, a regimen most Alliance races take to well. The Eldritch are an exception in how frequently they have trouble with it.
Redmond's
Also called 'redmens' as a way to remember it (because it causes the blood vessels in the viscera to burst, which makes the patient's insides look red).
Yuvett's Syndrome
Margeaux Davis had this. She lived much longer than typical. "Most children born with Yuvett's die before they reach four years of age." Seizures are can occur during early stages, and are typical in advanced stages. [2]