Table 1.

Frequency and examples of symptoms mentioned in sample tweets grouped by body system.

Symptom group	n	Symptom	n	Examples of tweets
Respiratory	16504	Cough	9710	I was told today that I was presumed positive for COVID-19. Last night what had been severe seasonal allergies seemed to become serious symptoms. A dry, persistent cough that brought up blood, shortness of breath, and diaphoresis. I was pre-authorized to be tested.
		Shortness of breath or difficulty breathing	4545	Quarantine Day 2: Breathing is still very labored, energy at all time low. Began to get some smell and taste back, hands and knees still ache. Can move more than twice without coughing hysterically, feels impossible to get sleep. If this isn’t covid idk what is.
		Sneezing	878	When I am at the grocery store, I am now scared to cough, sneeze, or even clear my throat, for fear of people thinking I have covid.
		Sore throat	616	I had mild coronavirus, sore throat, slight cough, no fever, lump in throat, sinusitis, dizziness over a couple of days
		Congestion or running nose	525	My aunt and uncle are doctors who had Covid-19 w/ mild symptoms (slight fever, runny nose, sore throat). Uncle is still testing positive now w/o symptoms for 3 weeks after onset. Their message is to act like you and everyone around you is infected and STAY HOME!
		Chest pain	125	Resting in bed so far today as still quite out of puff, cough, chest pain. The ED consultant said most likely Covid (thankfully ruled out cardiac cause).
		Chest tightness	105	I have a friend who has Covid-19. She went to the hospital a few weeks ago with the symptoms fever, headache body ache tight chest. They didn’t test her for corona. They sent her home saying it was just some virus. After feeling a bit better she lost her sense smell and taste.
Immunologic	9405	Fever	8644	I’m pretty sure I had COVID. I suddenly had a high fever (~102.8), extreme body aches, and a dry cough.
		Chills	581	Literally think have corona, I’m all achy and was shivering last night and have fever.
		Sweating	120	Hard to breathe, sweating, tiredness … I feel like I only feel the symptoms of Covid-19
		Inflammation	60	The range of symptoms caused by Covid which include dry cough, fever and of course the dangerous inflammation of the respiratory system.
Neurologic	8498	Loss of taste	3898	Heard no taste is a cause of coronavirus. 22 yr old Boise woman tested positive for the coronavirus with one primary, obscure symptom - loss of taste and smell.
		Loss of smell (e.g., anosmia)	2458	Can you really lose your sense of smell from coronavirus?
		Headache	1112	A person who had been informing me about the health of a close friend of hers who had COVID-19 and was in the hospital on life support has now been admitted to the hospital herself with pneumonia, fever, loss of smell and taste, cough, headaches, etc. Waiting on a test. Awful.
		Confusion	554	Coronavirus symptoms take new shape. Confusion and pink eye and can be first symptoms.
		Insomnia	381	Anyone else find themselves suffering from insomnia during this pandemic?
		Dizziness	80	I called out sick from work today with dizziness and mild fever. Work called me later to tell me that I MUST get tested for Covid, that I am not allowed back in the building until they receive my negative results, and that I cannot get sick pay without proof I have it. F**k.
		Tinnitus	15	My coronavirus patients being treated with anti-malaria drug its potential side effects include vomiting, skin rashes, and ear ringing.
Gastrointestinal	4028	Abdominal Pain	3292	I had all the symptoms of covid, major breathing coughing issues, sore throat, headache stomachache not able to eat.
		Diarrhea	735	Last week of January I got super sick with cough, vomiting, diarrhea, respiratory probs, headaches, body aches + fever. Tested neg for strep, flu, and mono. Couldn’t get over it for a month bc of starting a new semester. I wish the covid-19 test was avail back then
		Nausea	263	Went on a drive by for a COVID testing after experiencing a scary episode of the flu yesterday, fever, massive headache, nausea and vomiting. Even though I have been socially distant for almost 4 weeks, constantly
		Vomiting	263	Hello friends. I have 4 symptoms of COVID. I was washing my hands yesterday and started vomiting in the sink for no reason. No fever. Breathing ok. Throat hurts. Chest feels a tiny bit off but it could be anxiety. Current CDC direction is to wait at least 7 days in q-tine.
		Flatulence	183	I used to cough to cover a fart. Now I fart to cover a cough.
		Appetite loss (e.g., Anorexia)	129	I had all the symptoms of covid, major breathing coughing issues, sore throat, headache stomachache not able to eat.
		Dysphagia	27	Hurts to swallow, but no sore throat. My doctor was not concerned.
Muscular	1981	Fatigue	1374	You can be positive for coronavirus with only symptoms like fatigue, conjunctivitis, or chest tightness/pain.
		Muscle or body ache	477	Most coronavirus patients are mild with symptoms like muscle aches, fatigue, runny nose, sore throat, or diarrhea.
		Weakness	130	Some of the first warning signs for coronavirus can be extreme fatigue, weakness and chills.
Skin	227	Skin issues (e.g., skin lesions, itching)	221	The doctor says my persistent cough and skin lesions are definitely not covid.
		Toe skin problem	6	COVID toes present with blue and red around toes.
Cardiovascular	202	Blood clots related	163	Some bad news just now about a distant acquaintance who was finally admitted to hospital with Coronavirus flu-like symptoms, mostly sweating, fever. Don’t know if he’s positive, but they found blood clots around his lungs. Is this a related symptom anyone’s heard of before?
		Arrhythmia	39	Potential side effects of chloroquine include fatal heart arrhythmia, vision loss.
Eye	127	Pink eye (e.g., conjunctivitis)	97	Almost certain at this point my boys had Covid-19 in February. We went out of town, my mom watch them for a few days. They all got sick, cough, fever, pink eye. She developed “pneumonia”.
		Eye pain	18	I had many of the symptoms of Covid in January- dry cough that made it so I couldn’t talk and could barely breathe. I would start coughing and it just never ended. Fever, body aches, eye pain, extreme tiredness- I couldn’t leave my house for my classes for two weeks.
		Vision change	12	Did anyone else notice the side effects from taking hydroxychloroquine? Disturbing dreams, hallucinations, blurry vision.
Renal	31	Any kidney issues	31	Please pray for her friend that is battling for her life in ICU due to Covid 19 with double pneumonia fever is on ventilator laying on her tummy and has been given dialysis to relax her kidneys and lungs.
Asymptomatic	274	No symptoms	274	I’ve seen multiple patients showing no symptoms but spiked a fever and dialysis sends them to the ER. Pt says they feel fine, Covid test comes back positive. Fever, a dry cough and shortness of breath are among the most common, but some people with the coronavirus feel no symptoms at all.