1. Mild

2.  Moderate

3. Severe

4. Critical

The Severity of  COVID-19 Symptoms

Studies have identified various trends in symptoms of COVID-19 patients by age groups 

Symptoms of COVID-19 by Age Groups

Until April 26, 2020, CDC warned of the three symptoms that may be indicative of COVID-19; fever, cough and shortness of breath.  As of July 9, 2020, the center added ten more symptoms to the list, now totaling thirteen symptoms listed below that may indicate the existence of the disease: 

As of July 9, 2020:
- Cough
- Shortness of breath or difficulty breathing
- Fever
- Chills
- Repeated shaking with chills
- Muscle pain
- Headache
- Sore throat
- New loss of taste or smell
- Sore throat
- Congestion or runny nose
- Nausea or vomiting
- Diarrhea


CDC List of COVID-19 Symptoms

Studies of COVID-19 Symptoms by Geographic Location

Around 1 out of every 6 people who gets COVID-19 becomes seriously ill and develops difficulty breathing.  Other factors may increase the risk of severe symptoms

Rate of Appearance of Severe Symptoms

As of July 9, 020, the CDC has warned that people look for the following emergency warning signs for COVID-19 that need medical attention:
- Trouble breathing
- Persistent pain or pressure in the chest
- New confusion
- Inability to wake or stay awake
- Bluish lips or face

Symptoms that Call for Medical Attention

Even in the absence of typical respiratory symptoms such as fever, cough, and shortness of breath, various patients diagnosed with COVID-19 have presented neurological symptoms, such as:

- acute cerebrovascular diseases

- impaired consciousness

-  skeletal muscle injury

- encephalopathy (symptoms: ischemic stroke)

- loss of smell (anosmia) and taste (ageusia)

- stroke

- cranial nerve deficits

- delirium

- meningitis

- paralysis

- seizures

- neuroinflammatory syndromes

- high pressure CSF

- muscle stiffness

The list below includes less-common neurological symptoms of COVID-19:
- Guillain–Barré syndrome (GBS)
- Multisystem Inflammatory Syndrome in Children (MIS-C)

Neurological symptoms Presented in COVID-19 Patients

This data has been drawn from the research firm Dynata examining symptom reporting by Americans released in July of 2020.  Symptoms are most commonly reported among those living in extreme poverty or extreme wealth, with lower reporting of those among middle incomes.  A similar pattern is demonstrated among those with remarkably little educational achievement and those with remarkably high educational achievement.  Although data is not selected from a representative sample, sample sizes are large.

Symptoms of Covid-19 by Socio-economic Group in US

The most common symptoms of COVID-19 are fever, tiredness, and dry cough. Some patients may have aches and pains, nasal congestion, runny nose, sore throat or diarrhea. These symptoms are usually mild and begin gradually. Most people (about 80%) recover from the disease without needing special treatment. 

Smith College

University of Michigan - Ann Arbor

Presence and severity of symptoms of COVID-19 depend largely on individual characteristics. COVID-19 produces both symptomatic and asymptomatic infection.

Symptomology of COVID-19 

Frequently Asked Questions of Covid-19 https://www.un.org/sites/un2.un.org/files/new_dhmosh_covid-19_faq.pdf

Covid-19 Frequently Asked Questions

The incubation period refers to the time from exposure to an infectious agent until the first sign of symptoms related to disease.
The incubation period for COVID-19 is thought to be 2 to 14 days.

COVID-19 Incubation Period

Symptomatic COVID-19 Infection

- Asia
- Africa 
- North America
- South America
- Antarctica
- Europe
- Australia

Studies on the Serial Interval of COVID-19 Categorized by Continents 

- Acta Paediatrica
- American Journal of Obstetrics & Gynecology MFM
- bioRxiv (Preprint)
- Frontiers in Pediatrics
- Immunological Reviews
- JAMA
- Morbidity and Mortality Weekly Report
- New England Journal of Medicine
- The Lancet
- Mycoses



References for Symptomology of COVID-19 Categorized by Journal

- Geographic Location
- Demographic Group

Categorizations of Symptomology of COVID-19

Several studies have shown that COVID-19 can be transmitted by individuals who do not show any symptoms, or who are "asymptomatic". Because asymptomatic individuals are not routinely tested, the prevalence of asymptomatic infection is not well-defined.

Asymptomatic COVID-19 Infection

Currently, there is no FDA-approved, consistent treatment plan for COVID-19. Treatment depends on the severity of disease, the patient's ability to self-isolate, and the presence of other risk factors. Individuals with mild to moderate cases of COVID-19 are able to treat themselves at home without hospitalization or clinical care. If an individual is hospitalized, treatments will focus on managing the most common and severe COVID-19 complications. 

Therapeutic Treatment of COVID-19

key symptoms and biochemical/radiological features of clinical course of COVID-19

Clinical Course of COVID-19 (graphic)

- Gastrointestinal (GI) distress
- Sensorineural impairment
- Loss of smell and taste
- Dysregulated blood clotting
- Hepatitis
- Acute cardiac and renal injury irrespective of age and health status

Symptoms shown by individuals infected with COVID-19

Researchers have found 42.3% of people infected with COVID-19 still have symptoms after 30 days of infection, 33.8% after 60 days and 24.1% after 90 days. Infected people with more initial symptoms are more likely to have long term effects of the virus. Symptoms like anosmia, ageusia, difficulty concentrating, difficulty breathing, memory loss, confusion, headache, chest pain etc were significantly enriched in COVID-19 patients after 30 days. 

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