Lethargy

lethargiclack of energydepressiondrowsinessgrew lethargiclistlesspoor activitysluggishness
Lethargy is a state of tiredness, weariness, fatigue, or lack of energy.wikipedia
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Fatigue

exhaustionOverexertionfeeling tired
Lethargy is a state of tiredness, weariness, fatigue, or lack of energy.
It can manifest as somnolence, lethargy, or directed attention fatigue.

Encephalitis lethargica

sleeping sicknessa worldwide epidemic of sleeping sicknesslethargic encephalitis
Encephalitis lethargica, also known as "sleeping sickness"
It is characterized by high fever, sore throat, headache, lethargy, double vision, delayed physical and mental response, sleep inversion and catatonia.

Alcoholic drink

alcoholic beveragealcoholalcoholic beverages
It may also be a side-effect of medication or caused by an interaction between medications or medication(s) and alcohol.
A BAC of 0.09% to 0.25% causes lethargy, sedation, balance problems and blurred vision.

Somnolence

drowsinesssleepinessdrowsy
It can be accompanied by lethargy, weakness, and lack of mental agility.

Effects of long-term benzodiazepine use

long-term use of benzodiazepinesContinued use despite harmful consequencesLong term use
Some of the symptoms that could possibly occur as a result of a withdrawal from benzodiazepines after long-term use include emotional clouding, flu-like symptoms, suicide, nausea, headaches, dizziness, irritability, lethargy, sleep problems, memory impairment, personality changes, aggression, depression, social deterioration as well as employment difficulties, while others never have any side effects from long-term benzodiazepine use.

Canine distemper

distempercanine distemper virusCanine morbillivirus
In canines, distemper affects several body systems, including the gastrointestinal and respiratory tracts and the spinal cord and brain, with common symptoms that include high fever, eye inflammation and eye/nose discharge, labored breathing and coughing, vomiting and diarrhea, loss of appetite and lethargy, and hardening of nose and footpads.

Aminoglutethimide

aminoglutethemide
Side effects of AG include lethargy, somnolence, dizziness, headache, appetite loss, skin rash, hypertension, liver damage, and adrenal insufficiency, among others.

Altered level of consciousness

level of consciousnessaltered mental statusdecreased level of consciousness
A mildly depressed level of consciousness or alertness may be classed as lethargy; someone in this state can be aroused with little difficulty.

Dog days

dog-daysdog-dayCanicular
They were historically the period following the heliacal rising of the star system Sirius, which Greek and Roman astrology connected with heat, drought, sudden thunderstorms, lethargy, fever, mad dogs, and bad luck.

Health effects of wine

red winehealth benefits of winebeneficial effect
Wine has a long history of use as an early form of medication, being recommended variously as a safe alternative to drinking water, an antiseptic for treating wounds, a digestive aid, and as a cure for a wide range of ailments including lethargy, diarrhea and pain from child birth.

Canine parvovirus

Parvoparvovirusparvovirus, canine
The signs may include lethargy, vomiting, fever, and diarrhea (usually bloody).

Pediatric ependymoma

pediatric cases
Symptoms associated with the development of pediatric ependymomas are varied, much like symptoms for a number of other pediatric brain tumors including vomiting, headache, irritability, lethargy, and changes in gait.

Severe acute respiratory syndrome

SARSSARS outbreakSevere Acute Respiratory Syndrome (SARS)
Initial symptoms are flu-like and may include fever, muscle pain, lethargy symptoms, cough, sore throat, and other nonspecific symptoms.

Psilocybin

psilocybine4-PO-DMT (Psilocybin)psilo-
After ingesting psilocybin, a wide range of subjective effects may be experienced: feelings of disorientation, lethargy, giddiness, euphoria, joy, and depression.

Sickness behavior

sicknesssickness behavioursickness behaviour.
Such illness responses include lethargy, depression, anxiety, malaise, loss of appetite,

Gloom

Low light and lack of color of this sort is associated with depression and lethargy.

Congenital hyperinsulinism

beta cell dysregulation syndromecongential hyperinsulinismislet cell adenomatosis
Hypoglycemia in early infancy can cause jitteriness, lethargy, unresponsiveness, or seizures.

That Sugar Film

As a result, Gameau gained weight, grew lethargic, and developed fatty liver disease.

Metagonimiasis

Clinical complaints can also include lethargy and anorexia.

Succinic semialdehyde dehydrogenase deficiency

4-hydroxybutyric aciduriasuccinate-semialdehyde dehydroxylaseγ-hydroxybutyric aciduria
Problems unique to neonates can include prematurity, lethargy, decreased sucking, respiratory difficulty and hypoglycemia.

Baby colic

colicinfant colicinfantile colic
Concerning findings include a fever, poor activity, or a swollen abdomen.

Hepatomegaly

enlarged liverliver enlargementliver
Symptoms having to do with hepatomegaly can include several, among them the individual may experience some weight loss, poor appetite and lethargy (jaundice and bruising may also be present)

Poliomyelitis

polioinfantile paralysisparalytic polio
Most patients with CNS involvement develop nonparalytic aseptic meningitis, with symptoms of headache, neck, back, abdominal and extremity pain, fever, vomiting, lethargy, and irritability.