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 are pyrexic and comatose and suffer from widespread synaptic degradation. Long term memory, usually from the moment of infection, is destroyed.

Achilles fever
Deadly disease capable of spreading rapidly in a planetary population and causing widespread and painful deaths in the millions.

Arethian Fever
Viral disease.

Andronesian encephalitis
A disease transmitted by air borne particles

Aphasia
Dysfunction of certain brain centers affecting the ability to communicate in a coherent manner. Different forms of aphasia exist

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. Progressive Atherosclerosis could necessitate replacing the aorta.

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

Ba'ltmasor Syndrome
A disease that plagued Klingon exobiologist J'Ddan. He required regular treatments, given by injection, for the problem

Bendii Syndrome
A rare illness that sometimes 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 patient's metathalamus. A dangerous side effect of Bendii Syndrome is that the loss of emotional control can be telepathically projected to others.

Cartalian Fever
A deadly viral plague.

Cholera
Acute infectious enteritis, common on Earth in the 19th and 20th centuries, caused by the organism Vibrio cholerae.

Cold, Common
An infection of the upper respiratory tract caused by any of over 200 viruses in many humanoid species. By the 24th century the common cold was a curable ailment.

Correllium fever
A disease that broke out on the planet Nahmi IV in 2366.

Darnay's disease
A deadly ailment that attacks the brain and nervous system of its victims.

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

Enantiodromia
Psychological term that literally means conversion into the opposite.

Eosinophilia
An abnormally high count of serum eosinophilis, a type of white blood cell in humanoids.

Forrester-Trent Syndrome
Degenerative neurological disorder.

It is very rare, but if left untreated, can result in paralysis and even death.

The syndrome is usually hereditary but can be activated by a random mutation.

A neurostabilization regimen can stabilize or reverse the disease.

Fostossa Virus
Disease organism.

Fostossa virus was epidemic on Bajor during the Cardassian occupation, killing thousands of Bajorans.

A cure for the disease was developed by Dr. Crell Moset, but only after extensive experimentation on Bajoran prisoners, resulting in the painful death of many of those unwilling subjects.

Hemocythemia
medical condition in which intercellular pressures are unstable.

This condition was also called Hemocythemic Imbalance and could be treated with osmotic pressure therapy.

Hesperan Thumping Cough
A flu like affliction.

Holodiction
Contraction for holodeck addiction. A psychological condition where an individual becomes so caught up in holographic simulations that the real world becomes unimportant.

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

Hyperacceleration
Biochemical condition that plagued the people of the planet Scalos due to radiation permeating their water supply. Hyperacceleration of biological processes caused an individual so affected to experience one second as if it were an entire hour. Outsiders who were accelerated quickly burned out, dying in a very short period of time due to cell damage. To a normal, nonaccelerated person, a Scalosian sounded very much like an insect.

Iresine Syndrome
A very rare neurological disorder in humanoids characterized by a peculiar electropathic signature in the thalamus, and a severely decreased histamine count. Victims of the disorder, first identified in the 23rd century, would fall suddenly into a coma for approximately 72 hours. Diagnosis could be confused by the presence of any of 22 different substances that left electropathic residue resembling that of this disorder.

Iverson's disease
A chronic disease that causes fatal degeneration of muscular functions in humans. Iverson's disease does not, however, impair mental functions. There is no known cure for the condition.

Kalla-Nohra Syndrome
Chronic pulmonary disease found only in individuals exposed to a mining accident at Gallitep, a Bajoran labor camp run by the Cardassians. There are no known 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 that infamous death camp.

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
Mild disorder

Morphogenic virus
A virus engineered by Section 31 with the intent of killing the Founders who link with Odo. In 2372, The main symptom is a decreasing ability to shapeshift, accompanied by pain and peeling skin; the progress is accelerated by frequent shape shifting and in the final stage of the disease, the Changeling cannot revert back to liquid state at all and die in a solid form. The cure for the disease contains a nucleotide marking sequence consisting of adanine, asporadine, lytastolanine, and radanine.

Neural depletion
Complete loss of electrochemical energy of a humanoid brain, resulting in the death of the victim.

Neural metaphasic shock
A potentially fatal failure of the neurological system in humanoids.

Nitrogen Narcosis
Also known as ""Rapture of the Deep,"" nitrogen narcosis was a hazard of 20th century Earth deep-sea diving. It was caused by the replacement of oxygen in oxyhemoglobin with nitrogen. The resultant anoxia produced disorientation, hallucinations, and lack of judgment in the victims. The phenomenon is similar to temporal narcosis.

OMAS

Orket's disease
A childhood virus that swept through Bajoran work camps during the Occupation. It killed thousands of Bajoran children.

Phyrox Plague
A disease that broke out on the planet Cor Caroli V. The crew of the Enterprise-D was successful in eradicating the plague in 2366. Starfleet Command classified the incident as Secret.

Plasma plague
A group of deadly virus types. An unclassified but extremely virulent strain of plasma plague threatened the densely populated Rachelis system in 2365. Significant research into plasma plague was conducted by Dr. Susan Nuress in 2295 in response to a similar outbreak on the planet Obi VI. One mutated strain developed during Nuress's research was found to grow more rapidly when exposed to eichner radiation.

Pottrik Syndrome
Disease that Aamin Marritza claimed to have, which was similar to Kalla-Nohra Syndrome, and was even treated by the same medication. A lower pulmonary bioprobe for Pottrick Syndrome shows up as negative whereas for Kalla-Norha, it shows up as positive.

Psi 2000 Virus
A water based disease organism originally found on the planet Psi 2000 in 2266.

This virus infected members of the Federation science team stationed on that planet, causing suppression of their inhibitions, and ultimately their deaths.

Transmitted through human perspiration, the virus later infected members of the Enterprise crew, resulting in the near destruction of the starship when infected crew member Kevin Riley disabled the ship's engines while it was in orbit around the disintegrating planet.

Radiohumeral Bursitis
The inflammation of the muscles attached to the epicondyle of the humorous of the human forearm. The inflammation was caused by the stress of striking the ball with a racquet in the ancient sport of tennis.

Rigelian fever
Deadly disease resembling bubonic plague. Known antidote is ryetalyn

Rigelian Kassaba Fever
As a ruse to regain control of the Enterprise in 2268 when commandeered by the Kelvans, Dr. McCoy claimed that Spock suffered from Rigelian Kassaba fever and required treatment with Stokaline injections.

Rop'ngor
A disease that sometimes affects Klingon children, somewhat akin to terrestrial measles.

Rushton Infection
Disease

Sakuro's disease
An extremely rare disease contracted by Commissioner Nancy Hedford which can cause intense fever, weakness, and death if not treated.

SsomatoPhysical failure
In humanoid physiology, the collapse of all bodily systems.

Stockholm Syndrome
In psychology, the tendency for hostages to sympathize with their captors after extended captivity.

Streptacochlial-bola-spongiform-diadinate
Sneezing, Shortness of breath, Red-Blue-Green spots, Blurring vision, Hallucinations, Increased aggression, illogical activity, Loss of motor control, Paranoia and Delusions of Grandeur.

The Virus eats away at the body, traveling along the nervous system and blood vessels. The body is unable to fight off the infection and normal antidotes are in-effective.

Placing the patient in stasis has little or no discernable effects. It attacks only bodies with certain "T-cells common to all species. Incubation period is between 2 -8 days then the first symptoms appear. In later stages the patient has weeping sores that expand, this can take anything from a few days to three weeks to occur.

In the final stage the victim displays remarkable logic and clear thoughts almost tripling their intelligence. This stage lasts no more than forty minutes before the patient convulses and dies. The body then disintegrates to a mushy pulp and after twenty minutes leaves no traces.

Symbalene blood burn
Virulent disease that can rapidly kill a large number of people in a very short period of time.

Synthococcus novae
Bacillus strain organism, a by-product of modern technology. Although treatable, the deadly bacillus was regarded as a significant health hazard.

Tahiti Syndrome
Twentieth century term or a human longing for a peaceful, idyllic natural setting when suffering from the stresses of modern life.

Telurian plague
A terrible disease that was still incurable in the 2360s.

Temporal narcosis
Delirium produced by exposure to a temporal disturbance.

Tennis elbow
Twentieth century Earth slang for radiohumeral bursitis. The inflammation of the muscles attached to the epicondyle of the humerus of the human forearm. The inflammation was caused by the stress of striking the ball with a racquet in the ancient sport of tennis.

Thelusian flu
An exotic but harmless rhinovirus.

Transporter psychosis
Rare medical disorder caused by a breakdown of neurochemical molecules during transport. Transporter psychosis was first diagnosed in 2209 by researchers on the planet Delinia II. The condition affected the body's motor functions, as well as autonomic systems and higher brain functions. Victims were found to suffer from paranoid delusions, multi-infarct dementia, tactile and visual hallucinations, and psychogenic hysteria. Peripheral symptoms included sleeplessness, accelerated heart rate, myopia, muscular spasms, and dehydration. The problem was eliminated around 2319 with the development of the multiplex pattern buffer.

Tuvan syndrome
A degenerative, incurable neurological disease which affects mainly Vulcans, Romulans, and Rigellians. In the very early stages, the patient's eyelids are slightly displaced, facial muscles are weakened, and respiration is irregular. Loss of motor skills occurs in 10-15 years; life expectancy is 20-25 years. In less than 5% of cases, the disease can accelerate without warning.

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

Xenopolycythemia
Disease characterized by an abnormal proliferation of red blood cells causing varied symptoms including weakness, fatigue, enlarged spleen, and pain in the extremities.

Yarim-Fel syndrome
A terminal illness affecting Cardassians; it attacks the digestive tract, circulatory and respiratory systems, and cartilaginous tissues. It can be treated with hexagen therapy or neuro-regeneration procedures, but there is apparently no cure.

Zanthi fever
A virus affecting the empathic abilities of "mature" Betazoids. It causes brief, intense headaches, during which the sufferer unconsciously projects his or her emotions onto others nearby, provided those emotions already exist in those others subconsciously. Fortunately, the sufferer is easily cured with a simple wide-spectrum antibiotic, and the effects on other people wear off in a day or two.

Zintels Disease
See Streptacochlial-bola-spongiform-diadinate