Symptoms of mild acute poisoning include lightheadedness, confusion, headaches, vertigo, and flu-like effects ; larger exposures can lead to significant toxicity of the central nervous system and heart, and even death.

Symptoms of acute toxicity may include agitation, sweating, increased blood pressure and heart rate, dramatic increase in body temperature, convulsions, and death.

Symptoms of a more severe metal toxicity may also include a burning sensation in the body, shock, no urine output, collapse, convulsions, shortness of breath, yellow eyes or yellow skin, rash, vomiting, watery or bloody diarrhea or low blood pressure, which require prompt medical attention.

Symptoms of CMT usually begin in late childhood or early adulthood.

Symptoms should begin to improve within 5 minutes, though full recovery may take 10 – 20 minutes.

Symptoms of Lafora disease begin to manifest themselves in children from 10 to 17 years old.

Symptoms of Huntington's disease commonly become noticeable between the ages of 35 and 44 years, but they can begin at any age from infancy to old age.

Symptoms of late-onset Tay – Sachs-which typically begin to be seen in adolescence or early adulthood – include speech and swallowing difficulties, unsteadiness of gait, spasticity, cognitive decline, and psychiatric illness, particularly a schizophrenia-like psychosis.

Symptoms of arsenic poisoning begin with headaches, confusion, severe diarrhea, and drowsiness.

Symptoms can take as long as a week to show up, but most often begin two to four days after ingestion.

Symptoms may begin within 16 hours of exposure and typically peak two to four days after onset.

Symptoms may begin suddenly with the onset of the disease and steadily become more prevalent with each progressive small stroke.

Symptoms usually begin in early adulthood ; diagnosis prior to age 13 is rare.

Symptoms commonly begin to appear once the stones reach a certain size (> 8 mm ).

Symptoms of dysmenorrhea often begin immediately following ovulation and can last until the end of menstruation.

Symptoms typically begin one to two weeks after infection and may wane and reappear cyclically.

Symptoms may begin early in life or in adulthood and include enlarged liver and grossly enlarged spleen ( together hepatosplenomegaly ); the spleen can rupture and cause additional complications.

Symptoms begin in the late luteal phase of the menstrual cycle ( after ovulation ) and end shortly after menstruation begins.

Symptoms begin some six days after exposure ( between 4 and 28 days, with the average being 16 to 17 days ) and last about a week.

Symptoms begin shortly after ingestion.

Symptoms of colic begin to appear within the first day, and all LWS-afflicted foals die within the first few days of life.

Symptoms usually appear in men at about ages 8 – 25, but may sometimes begin later.

Symptoms most often first appear in early childhood ( the toddler stage ) when children begin to walk.

Symptoms may begin at any age, and may develop quickly or slowly.

Symptoms usually begin two to three days after exposure, and can progress to lower respiratory infections such pneumonia.

Symptoms begin between the ages of 3 and 6 months with irritability, fevers, limb stiffness, seizures, feeding difficulties, vomiting, and slowing of mental and motor development.

Symptoms typically begin sometime between the ages of 5 to 15 years, but in Late Onset FA may occur in the 20s or 30s.

Symptoms typically appear two to six weeks after infestation for individuals never before exposed to scabies.

Symptoms may appear months or even years after the initial injury, starting with pain, weakness, and sensory impairment originating at the site of trauma.

Symptoms usually appear 12 – 36 hours after eating, but can also appear within 6 hours to 10 days.

Symptoms often appear in infancy and childhood, such as bowel obstruction due to meconium ileus in newborn babies.

Symptoms of MS usually appear in episodic acute periods of worsening ( called relapses, exacerbations, bouts, attacks, or " flare-ups "), in a gradually progressive deterioration of neurologic function, or in a combination of both.

Symptoms may appear or change as a child gets older.

Symptoms of Canavan disease, which appear in early infancy and progress rapidly, may include mental retardation, loss of previously acquired motor skills, feeding difficulties, abnormal muscle tone ( i. e., floppiness or stiffness ), poor head control, and megalocephaly ( abnormally enlarged head ).

Symptoms of acute cyanide intoxication appear four or more hours after ingesting raw or poorly processed cassava: vertigo, vomiting, and collapse.

Symptoms usually appear between the ages of 6 and 20 years, but cases in much older people have been described.

Symptoms of cancer often appear by high school or college age.

Symptoms usually appear in women within 5 to 28 days of exposure.

Symptoms will often appear overnight, affecting many types of plants.

Symptoms include leaves turning yellow or brown in the margins between the veins which may remain green, while young leaves may appear to be bleached.

Symptoms do not appear for 5 to 24 hours, when the toxins may already be absorbed and the damage ( destruction of liver and kidney tissues ) done.

* Symptoms appear predictably during the luteal ( premenstrual ) phase, reduce or disappear predictably shortly before or during menstruation, and remain absent during the follicular ( pre-ovulatory ) phase of the menstrual cycle.

Symptoms can appear directly after the injury, but often are not felt until days afterwards.

Symptoms or signs of mesothelioma may not appear until 20 to 50 years ( or more ) after exposure to asbestos.

Symptoms appear from two to ten days after infection, with an average of 7 days, and last for up to two weeks, or in some cases, up to one month.

Symptoms may not appear for some decades after the initial infection and include: weakness, diminished reflexes, paresthesias ( shooting and burning pains, pricking sensations, and formication ), hypoesthesias ( abnormally diminished cutaneous, especially tactile, sensory modalities ), tabetic gait ( locomotor ataxia ), progressive degeneration of the joints, loss of coordination, episodes of intense pain and disturbed sensation ( including glossodynia ), personality changes, urinary incontinence, dementia, deafness, visual impairment, positive Romberg's test, and impaired response to light ( Argyll Robertson pupil ).

Symptoms typically appear 2 to 6 weeks ( the incubation period ) after the initial infection.

Symptoms appear progressively, and often lead to complete bone marrow failure.

# Symptoms appear under unusual conditions, making it hard to consistently reproduce the error.