Altarian Encephalitis - A retrovirus that incorporates its DNA directly into the cells of its host. The virus can lie dormant for years, but activate without warning. Victims would be pyrexic and comatose and would suffer from widespread synaptic degradation. Long-term memory, usually from the moment of the infection, would be destroyed.

Alvanian Spine Mites - Tiny parasitic insects that make their homes in humanoid spinal columns, causing the host pain for many years.

Anchilles Fever - Deadly disease capable of spreading rapidly in a planetary population and causing widespread and painful deaths in the millions.

Andronesian Encephalitis - A highly contagious airborne disease safely treated in Sickbay due to a superior air filtration system.

Aphasia - A perceptual dysfunction in which the brain incorrectly processes aural and visual stimuli, as well as other communication and comprehension function. Typically aphasia is associated with cranial trauma, such as a stroke or severe blow to the head.

Arethian Flu - Viral flu.

Atherosclerosis - A pathological condition in some humanoid species characterized by the hardening of the arteries and accompanied by the deposit of fat in the inner arterial walls.

Athelosclerosis - Chronic disease treated with vascular regeneration therapy.

-B-

Baltmasor Syndrome - Disease. Requires regular treatments by injections.

Barclays Protomorphosis Syndrome - An intron virus that causes humanoids and other animals to develop structural and behavioral characteristics of earlier evolutionary forms.

Bendii Syndrome - Rare illness that affects Vulcans over the age of 200. The disease is characterized by gradual loss of emotional control; victims exhibit sudden bursts of emotion and irrational anger. Diagnosis is made by culturing tissue from the patients metathalamus.

Blight, the - Disease unleashed on civilizations by the Jem'Hadar. Sufferers showed blue welts and lesions once they contracted the disease, but they began to die once the welts turn red in a phase known as "the quickening." The only known cure does not help the current generation of sufferers but would take effect in their newborns.

Blood Pyrasites, Distillate - Ferengi blood pyrasites in distillate form are known to wreak a serious allergic reaction in certain races.

-C-

Claustrophobia - An abnormal fear of being in an enclosed or confined place. Ensign Sato experiences claustrophobia in environmental suits.

Coleibric Hemorrhage - A blood discharge associated with Cardassian anatomy. A massive case can cause death while asleep.

Common Cold - An infection of the upper respiratory tract caused by any of over 200 viruses in many humanoid species.

Correllium Fever - Disease.

Cytotoxic Shock - Prostration of bodily function caused by high levels of cytotoxins, can be treated with Inaprovaline.

-D-

Darnays Disease - An incurable terminal disease which attacks the brain and central nervous system; symptoms visible by its final stage include coughing, pain, shortness of breath, and irritability and other erratic behavior.

Dermal Displasia - Medical skin disorder caused by an overexposure to the epidermis to hazardous levels of thermal and ultra-violet radiation.

Depressurization - The effects of depressurization begin with extreme pressure in the lungs. Extremities get cold and then go numb, and capillaries in some exposed sections of skin may burst. In all, useful consciousness lasts about 15 seconds, followed by 10 seconds of extreme disorientation and then unconsciousness.

Dorek Syndrome - Very rare and incurable disease that afflicts one out of every five million Ferengi.

Dream Deprivation - Deprival of sleep from the "rapid-eye movement" phase restricts dreaming and causes the loss of concentration and cognitive abilities. Paranoia, hallucinations, and insanity are all common symptoms.

-E-

Enantiodromia - Psychological term that literally means conversion into the opposite.

Engramatic Dissociation - Psychological phenomenon in which a person with a sufficiently disciplined mind can compartmentalize contradictory information, believing one thing while doing another.

-F-

Forrester-Trent Syndrome - Hereditary degenerative neurological disorder.

Fostossa Virus - Disease organism.

-G-

Genetic Metamorphosis - Means by which the Tarchannens, a non-sentient humanoid race reproduce.  Onset of symptoms can vary from days to an hour: blood chemistry changes, the skin develops blotchy blue surface veins and radiates its own light, and the middle three fingers fuse. With the immune system attacked, first the blood pressure and then body temperature drops.

-H-

Hemocythemia - Medical condition in which intercellular pressures are unstable. This condition is also called hemocythemic imbalance and could be treated with osmotic pressure therapy.

Hesperan Thumping Cough - A flu-like affliction.

Holodiction - Literally, "holodeck addiction," the condition of preferring holographic fantasies to reality.

Holotransference Dementia Syndrome (HTSD) - Medical condition in which a person becomes so disoriented within a holographic simulation that they lose their sense of identity and start to think they are part of the program.

Hyperaging Disease - Two types encountered whose chief symptoms include the rapid aging of human tissue and body systems.

Hyperglycemia - The human condition of high blood sugar.

Hypoglycemia - The human condition of low blood sugar.

-I-

Irumodic Syndrome - Degenerative disorder that causes progressive deterioration of the synaptic pathways. The disease can cause senility and eventually death. Treatment of choice for the disorder was Peridaxon, though this was simply a palliative; no cure exists.

Iversons Disease - A chronic degeneration of muscular functions in humans, though it does not impair mental functions. There is no known cure nor are there any known cases of remission.

-K-

Kalla-Nohra Syndrome - Chronic pulmonary disease. Kalla-Nohra Syndrome is only found in individuals exposed to a mining accident at Gallitep (A labor camp run by Cardassians during the Occupation). There are no know instances of anyone not involved with that mining accident contracting the disease, so a positive diagnosis makes it virtually certain that an individual has been at the infamous death camp.

Kamaraazite Flu - Severe symptoms characterize this nasty viral infection. Violent sneezing can cause patients to regurgitate their pineal gland.

-L-

Lacunar Amnesia - Type of amnesia that occurs when a patient witnesses an act of violence so terrible that the patient rejects the reality of the situation.

Larosian Virus - A viral infection.

Levodian Flu - Viral disease, whose infectious cycle normally lasts 29 hours. Symptoms include sneezing and a runny nose.

-M-

Memory Virus - Parasitic organism that thrived on the peptides generated by its hosts brain. The virus is able to evade the bodys immune system by disguising itself as an engram. The parasite would create a false memory for its host that was so traumatic that the hosts mind would repress it. The memory virus would live, in person after person, hiding in a part of the brain that the conscious mind would want to avoid at all costs. When it sensed the death of its host, the virus would leave to find another. Thoron radiation is lethal to the Memory virus.

Mendakan Pox - Humanoid disease characterized by skin mottling.

Metremia - A fatal degenerative blood disease caused by exposure to high concentration of metreon isotopes. 

-N-

Neural Metaphasic Shock - A potentially fatal failure of the neurological system in humanoids.

Neural Depletion - Complete loss of electrochemical energy of a humanoid brain.

Neural Shock - Shock induced in the neural pathways.

Neuroleptic Shock - Form of neurological disturbance in which cortical functions of the brains synaptic pathways are disrupted.

Neurochemical Imbalance - A serious physiological condition in Vulcans, the effect of the Pon farr mating drive.

Nitrogen Narcosis - Condition where there is too much nitrogen is dissolved in the blood stream.  This high nitrogen concentration impairs the conduction of nerve impulses and mimics the effects of alcohol or narcotics.

-O-

Orellius Infection - An affliction, otherwise unspecified, which is transmitted by an insect native to the Class M world colonized by Alixus and her unintended followers, who have not yet found a cure for it after 10 years as they have 17 others. Symptoms include swelling and high fever.

Orketts Disease - Viral sickness that swept through the Bajoran work camps during the Cardassian occupation of Bajor, killing thousands of children.

-P-

Parinisti Measles - Endoplasmic virus very infectious but not lethal if vaccine is administered.

Phage - Deadly virus in the Delta Quadrant. The Phage consumed the Vidiians bodies, destroying their genetic codes and cellular structures. One of the early symptoms of the Phage is joint pain. Some who are infected have been know to die from the agony itself. There is no know cure.

Phyrox Plague - Disease.

Plasma Plague - A group of deadly virus types.

Polycocyx Astris - This virulent species of space-dwelling microbe is found inside grains of interstellar dust. It can drift in a dormant state for millions of years before infecting a host and causing a rather nasty cold.

Pottrik Syndrome - Disease that affects Cardassians, similar to Kalla-Nohra syndrome. So alike are the two afflictions that they are treated with the same medications.

Psi 2000 Virus - A water-based disease organism causing a suppression of inhibitions that can lead to death (due to hazardous behavior, such as opening an airlock with out protective gear), it is transmitted through human perspiration.   Psi 2000 Virus is similar to Tsiolkovsky Infection.

Psychotropic Addiction - An addiction perpetuated by an effect directly on brain cells.

-R-

Radiation Poisoning - Myriad of conditions caused by exposure to certain levels of radiation. Side effects include hallucinations and muscle spasms brought on by a sudden decrease in serum calcium.  Treated by hyronalin.

Reaction, Histaminic - Symptoms of a system-wide histaminic reaction include: massive, body-weakening allergies and fever, leading to dizziness. It is not serious but recuperation takes several days. One cause is infection by a distillation of Ferengi own blood pyrasites.

Rigelian Fever - Deadly disease resembling bubonic plague.

Rigelian Kassaba Fever - Disease, treatment requires injections of Stokaline.

Ropngor - Disease that sometimes affects Klingon children, somewhat akin to Terran measles.

Rudellian Brain Fever - Type of illness.

Rudellian Plague - Disease.

Rugalan Fever - Deadly disease.

Rushton Infection - Disease.

-S-

Sakuros Disease - An extremely rare disease that can cause intense fever, weakness, and death if not treated.

Schizophrenia - Psychotic metal disorder with such symptoms as delusions, retreat from reality, and conflicting emotions.

Somatophysical Failure - The collapse of all bodily systems in humanoid physiology.

Symbalene Blood Burn - Virulent disease that can kill an entire planetary population in a very short period of time.

Synthococcus Novae - Dangerous bacillus-strain organism, a by-product of modern technology. Although treatable it is regarded as a significant heath hazard.

-T-

T-Cell Anomalies - A Bajoran dysfunction involving abnormalities to the vital types of white illness-fighting blood cells that is treated wiht ongoing immuno-therapy.

Telurian Plague - Incurable disease.

Teplan Blight - Viral disease, characterized by spider-like lesions that appear blue at birth but redden as death approaches, introduced the JemHadar to the Teplan System as retribution for not joining the Dominion. A vaccine was created the eradicated the disease from unborn children.

Temporal Narcosis - Delirium produced by exposure to a temporal distortion phenomenon.

Terellian Death Syndrome - Disease whose symptoms include dizziness, blurred vision, palpitations, and stinging in the lower spine. The disease is caused by cellular decay that can be reversed if caught early enough.

Terrellian Plague - Dangerously virulent disease.

Thelusian Flu - An exotic but harmless rhinovirus.

Transporter Psychosis - Rare medical disorder caused by a breakdown of the neurochemical molecules during transport. Symptoms include; paranoid delusions, multi-infarct dementia, tactile and visual hallucinations, and psyhchogenic hysteria. Peripherally; sleeplessness, accelerated heart rate, myopia, muscular spasms, and dehydration.

Transporter Shock - Rare phenomenon wherein a person experiences dizziness, headaches and disorientation after being transported, it quickly wears off and is usually the result to transporter malfunction.

Transwarp Evolutionary Syndrome - The side effect of traveling at transwarp speeds. For unknown reasons, the human body undergoes a metamorphosis as a result of being subjected to transwarp travel. Described as "genetic mutation, the body progresses through an evolutionary process at highly accelerated speeds. Organs mutate to new forms or functions, vestigial organs disappear, and new organs are generated. The syndrome also affects the emotional state of the victim, creating mood swings from normal lucidity to anger and paranoia. If the syndrome completely runs its course, the victim mutates completely into a salamander-like life form. The condition is treated with antiproton radiation therapy, which successfully reverses the effects and returns the patient to their human state.

Traumatic Stress Syndrome - Mental illness. Traumatic stress syndrome is a reaction to an extreme crisis and may cause symptoms of irritability, sleeplessness, obsessive thoughts, and reckless behavior.

Tsiolkovsky Infection - A waterborne viral infection that acts as a depressant on the body's neural system, lowering inhibitions by acquiring carbon from the body and acting on the brain as an intoxicant. Tsiolkovsky Infection is similar to the Psi 2000 Virus.

-U-

Urodelan Flu - A harmless disease but whose treatment with a synthetic T-cell causes the humanoids to de-evolve.

-V-

Vegan Choriomeningitis - Rare and deadly disease, symptoms include high fever, pain in the extremities, delirium, and death if not treated within 24 hours.

-X-

Xenophobia - In psychology, a fear of or prejudice against beings outside of ones own race.

Xenopolycythemia - Disease in humanoids characterized by and abnormal proliferation of red blood cells, specifically: erythrocytes, myelocytes and trombocytes causing varied symptoms including weakness, fatigue, enlarged spleen, pain in the extremities and the increasing viscosity and volume of blood flow causing serious congestion of all the tissues and organs.

-Z-

Zanthi Fever - Viral condition that affects the empathic abilities of mature Betazoids.