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Can Covid start with diarrhea?

Author

Emily Sparks

Published Jan 12, 2026

Diarrhoea is an early sign of COVID-19, starting on the first day of infection and building in intensity during the first week. It usually lasts for an average of two to three days, but can last up to seven days in adults.

What are some of the most common symptoms of the COVID-19 Delta variant?

Cough, fatigue, headache and loss of taste and/or smell continue to be the most commonly reported symptoms in those testing positive.

What are signs and symptoms of the coronavirus disease?

Signs and symptoms include respiratory symptoms and include fever, cough and shortness of breath. In more severe cases, infection can cause pneumonia, severe acute respiratory syndrome and sometimes death.

Standard recommendations to prevent the spread of COVID-19 include frequent cleaning of hands using alcohol-based hand rub or soap and water; covering the nose and mouth with a flexed elbow or disposable tissue when coughing and sneezing; and avoiding close contact with anyone that has a fever and cough.

Can you get COVID-19 more than once?

Yes, it is possible to get Covid-19 two, three or even more times. As new variants have emerged, and immunity from previous infection and immunisation has reduced over time, reinfection with Covid-19 has become increasingly common.

What are some of the symptoms of the omicron variant of COVID-19?

According to US CDC analysis, the five most common symptoms of the Omicron variant are cough, fatigue, congestion, runny nose and generalised body ache. Recently, the UK-based Zoe Covid app study added new symptoms such as nausea and loss of appetite.

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What are the common side effects of the Astra Zeneca COVID-19 vaccine?


The most frequently reported adverse reactions are injection site tenderness (68%), injection site pain (58%), headache (53%), fatigue (53%), myalgia (44%), malaise (44%), pyrexia (includes feverishness (33%) and fever ≥38°C (8%)), chills (32%), arthralgia (27%) and nausea (22%).

The majority of these adverse reactions were mild to moderate in severity and usually resolved within a few days of vaccination. Very rare cases of thrombosis with thrombocytopenia syndrome have been reported post-marketing within the first three weeks following vaccination (see section 4.4).

What are the possible side effects of the BNT162b2 COVID-19 vaccine?

The most common side effects with BNT162b2 (which may affect more than 1 in 10 people) were pain at the injection site, tiredness, headache, muscle pain, chills, joint pain and fever.

Can you still catch COVID-19 after having the booster vaccine?


Can you still catch COVID-19 after having the vaccine? The COVID-19 vaccination will reduce the chance of you suffering from COVID-19. It may take a few days for your body to build up some protection from the booster.

Can you still get Covid after vaccine?

Like all medicines, no vaccine is completely effective, so you should continue to take recommended precautions to avoid infection. Some people may still get COVID-19 despite having a vaccination, but this should be less severe.

Can I become infected with COVID-19?


COVID-19, along with many other respiratory infections such as influenza (flu), can spread easily and cause serious illness in some people. You may be infected with a respiratory virus such as COVID-19 and not have any symptoms but still pass infection onto others.

What are the organs most affected by COVID‐19?

The lungs are the organs most affected by COVID‐19

What should I do if I have symptoms of COVID-19?


If you have symptoms of a respiratory infection, such as COVID-19, and you have a high temperature or do not feel well enough to go to work or carry out normal activities, you are advised to try to stay at home and avoid contact with other people.

Can people with mild COVID-19 symptoms recover at home?

People with mild symptoms who are otherwise healthy should manage their symptoms at home. On average it takes 5–6 days from when someone is infected with the virus for symptoms to show, however it can take up to 14 days.

What are the most common adverse reactions to the covid-19 vaccine?

The most frequent adverse reactions in trials were pain at the injection site, fatigue, headache, myalgia (muscle pains), chills, arthralgia (joint pains), and fever; these were each reported in more than 1 in 10 people.

What are the common side effects of the COVID-19 vaccine?


Common side effects

  • having a painful, heavy feeling and tenderness in the arm where you had your injection. This tends to be worst around 1 to 2 days after the vaccination
  • feeling tired
  • headache
  • general aches, or mild flu like symptoms

How long after having COVID-19 can I get the spring booster vaccine?


If you are unwell, wait until you have recovered to have your vaccine. If you have had confirmed COVID-19 you should ideally wait 4 weeks before having your spring booster.

Can I develop immunity to COVID-19 after testing positive for PCR?

If you have previously tested positive for COVID-19, you will probably have developed some immunity to the disease. However, it cannot be guaranteed that everyone will develop immunity, or how long it will last. It is possible for PCR tests to remain positive for some time after COVID-19 infection.

How do we achieve herd immunity against COVID-19?

To safely achieve herd immunity against COVID-19, a substantial proportion of a population would need to be vaccinated, lowering the overall amount of virus able to spread in the whole population.

Does BCG vaccine protect you from getting the coronavirus disease?

There is no evidence that the Bacille Calmette-Guérin vaccine (BCG) protects people against infection with COVID-19 virus. Two clinical trials addressing this question are underway, and WHO will evaluate the evidence when it is available. In the absence of evidence, WHO does not recommend BCG vaccination for the prevention of COVID-19. WHO continues to recommend neonatal BCG vaccination in countries or settings with a high incidence of tuberculosis.

Does the COVID NHS pass show a COVID-19 booster?


COVID-19 booster vaccinations. You should get your COVID-19 booster as soon as you are eligible, but you do not need a COVID-19 booster vaccination to get an NHS COVID Pass for domestic use. If you've received a booster vaccination it will show in your NHS COVID Pass for travel within 5 days.

Can you go back to daily activities after having your COVID-19 vaccine?

You should be able to resume activities that are normal for you as long as you feel well. If your arm is particularly sore, you may find heavy lifting difficult. If you feel unwell or very tired you should rest and avoid operating machinery or driving.

What is the maximum interval for receiving the Pfizer-BioNTech and AstraZeneca COVID-19 vaccine?

The committee supports a 2-dose vaccine schedule for the Pfizer-BioNTech and AstraZeneca vaccines. Given the data available, and evidence from the use of many other vaccines, JCVI advises a maximum interval between the first and second doses of 12 weeks for both vaccines.

What are some common side effects of the COVID-19 vaccine in children?

Common side effects their arm feeling heavy or sore where they had the injection feeling achy or like they have the flu feeling tired having a headache

Is the COVID-19 vaccine safe?


The MHRA confirmed on 9 September 2021 that the COVID-19 vaccines made by Pfizer and AstraZeneca can be used as safe and effective booster doses. Following review of data for the COVID-19 Vaccine Moderna vaccine, the MHRA and CHM experts also concluded that this vaccine can be used as a safe and effective booster dose.

All vaccines and medicines have some side effects. These side effects need to be continuously balanced against the expected benefits in preventing illness. The COVID-19 Pfizer/BioNTech Vaccine was evaluated in clinical trials involving more than 44,000 participants. The most frequent adverse reactions in these trials

Can you get a fever or temperature after the COVID-19 vaccine?

Although a fever can occur within a day or two of vaccination, if you have any other COVID-19 symptoms or your fever lasts longer, stay at home and arrange to have a test.